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prof. Ing. Stanislav Pekárek, CSc.

Všechny publikace

Air Supply Mode Effects on Ozone Production of Surface Dielectric Barrier Discharge in a Cylindrical Configuration

  • DOI: 10.1007/s11090-021-10154-x
  • Odkaz: https://doi.org/10.1007/s11090-021-10154-x
  • Pracoviště: Katedra fyziky, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    We investigated the air supply mode effects on ozone production of the surface dielectric barrier discharge in the cylindrical configuration. The air into the discharge volume between two coaxial cylinders was supplied through four nozzles axially or tangentially. Using tangential air supply, the vortex flow in the part of the discharge chamber was created. Because the active electrode was in the form of interconnected rings on the outer surface of the glass tube, we changed the airflow orientation concerning this electrode. The existence of vortex airflow affects the plasmachemical processes taking part in the discharge, and therefore, it affects discharge ozone production. We also paid attention to ozone concentration and temperature of output air measurements as a function of the duration of the experiment for both tangential and axial air supply modes. We found that the time required for the stabilization of generated ozone concentration depends on the discharge power, and for our experimental conditions, it smaller than approximately 70 s. Besides, in the case of tangential air supply into the discharge chamber, the concentration of ozone produced by the discharge is for higher discharge power increased in comparison with the concentration for the axial air supply mode.

3D printing materials for generators of active particles based on electrical discharges

  • DOI: 10.1002/ppap.201900150
  • Odkaz: https://doi.org/10.1002/ppap.201900150
  • Pracoviště: Katedra fyziky, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    In this study, we focus our attention on the impact of ozone (O3) and ultraviolet radiation (UV) on materials usable for three‐dimensional (3D) printing. Specifically, we have studied the potential degradative effect on the most commonly used filaments, such as polylactic acid (PLA) and acrylonitrile–butadiene–styrene (ABS). The effect has been examined on objects printed on a 3D printer and on the materials of discharge chambers of O3 generators from which they were printed. For the purpose of adequate assessment of the actual impact of O3 and UV, samples were monitored for a period of 18‐hr of exposure. The methods of Raman spectroscopy, optical and scanning electron microscopy and Fourier‐transform infrared spectroscopy (FTIR) have been employed for an objective evaluation of potential modifications. A generator equipped with a chamber printed from a new PLA filament and an active electrode system in the form of a stripes electrode, or more precisely, in the second case, a honeycomb‐active electrode, both cut out of a thin copper foil, was used for the generation of O3 and UV radiation. The tested materials showed substantial resistance to O3 exposure under the test conditions. The result of measurements suggested that these materials could be used for chambers for the O3 as well as for active particle generation. In this study, we focus our attention on the impact of ozone (O3) and ultraviolet radiation on materials usable for three‐dimensional printing.

Driving voltage frequency and active electrode setup effects on ozone and UV generation of dielectric barrier discharge in air

  • DOI: 10.1140/epjd/e2020-100332-3
  • Odkaz: https://doi.org/10.1140/epjd/e2020-100332-3
  • Pracoviště: Katedra fyziky, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    We studied the effect of the driving voltage of frequencies 4, 7, and 10 kHz and two different active electrode setups on electrical properties, ozone production, and UV radiation of wavelengths 320-420 nm of the dielectric barrier discharge in air. The first active electrode setup comprised the strip electrode made from the copper foil. The second setup comprised the stainless steel wire mesh electrode with square cells. The ozone concentration, as well as the ozone production yield, is higher for the discharge with the strip active electrode setup than for the discharge with the mesh active electrode set up. The increased frequency decreases the voltage required to obtain maximum ozone concentration. The intensity of UV radiation is higher for the discharge with the mesh active electrode setup than for the discharge with the strip active electrode setup for all investigated frequencies. The intensity of UV radiation at a particular voltage depending on the frequency and active electrode setup sharply increases. The high concentrations of ozone produced by the discharge with the strip active electrode setup are accompanied by lower intensities of generated UV radiation. For the discharge with the mesh active electrode setup, the situation is reversed.

Effect of a diamond layer on the active electrode on the ozone generation of the dielectric barrier discharge in air

  • DOI: 10.1088/1361-6463/ab831f
  • Odkaz: https://doi.org/10.1088/1361-6463/ab831f
  • Pracoviště: Katedra fyziky, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    We investigated the effect of a non-doped diamond layer deposition on the active electrode of the dielectric barrier discharge in the air on its electrical characteristics and ozone generation. We found that this new non-traditional application of diamond layers affects electrical parameters of the discharge and increases not only the concentration of ozone produced by the discharge but also ozone production yield by similar to 70%. Considering obtained results together with the high corrosion resistivity and chemical inertness of the diamond layers, the application of these layers on the dielectric barrier discharge electrode can be an interesting alternative to the usage of photocatalysts for the enhancement of ozone generation by electrical discharges.

Acoustic Waves Effect on the Generation of Nitrogen Oxides by Corona Discharge in Air

  • DOI: 10.1088/1361-6595/aad10d
  • Odkaz: https://doi.org/10.1088/1361-6595/aad10d
  • Pracoviště: Katedra fyziky
  • Anotace:
    We studied the interaction of acoustic waves with negative corona discharge in air at atmospheric pressure. The application of acoustic waves on the discharge causes a mixing of ambient air with the gas between the electrodes, which results in cooling of the gas in the inter-electrode gap. As a rough indirect indicator of the discharge cooling, we used a concentration of nitrogen oxides generated by the discharge. We chose these oxides because they exhibit antibacterial properties. We showed that for a particular discharge power with increasing amplitudes of acoustic displacements, the concentration of generated nitrogen mono/dioxide decreases, and that this decrease could be attributed mainly to the temperature. We also found that application of acoustic waves on the discharge for a particular power substantially decreases transient spark frequency, increases the magnitude of the streamer onset voltage, and increases the difference between the streamer and spark onset voltage.

Experimental study of pulse polarity and magnetic field on ozone production of the dielectric barrier discharge in air

  • DOI: 10.1007/s11090-018-9914-2
  • Odkaz: https://doi.org/10.1007/s11090-018-9914-2
  • Pracoviště: Katedra fyziky
  • Anotace:
    We studied the combined effect of the pulse or sinusoidal driving voltage and magnetic field on electrical characteristics and ozone production of a dielectric barrier discharge in air. These effects were studied for both polarities of the pulse. We found that the pulse polarity, as well as the magnetic field, affects discharge ozone production only for higher powers. The discharge driven by sinusoidal voltage produces higher ozone concentration than the discharge driven by voltage pulses of negative polarity. The discharge driven by the voltage pulses of negative polarity produces higher ozone concentrations than the discharge driven by positive voltage pulses. Ozone production yield for the voltage pulses of negative polarity is similar to that of sinusoidal driving voltage. For the positive polarity of voltage pulses, the yield is lower. Magnetic field slightly increases the concentration of ozone produced by the discharge and ozone production yield only for the discharge driven by positive voltage pulses. For the discharge driven by the sinusoidal voltage or by the pulses of the negative polarity magnetic field has only small effect on the concentration of ozone produced by the discharge.

Experimental Study of Nitrogen Oxides and Ozone Generation by Corona-Like Dielectric Barrier Discharge with Airflow in a Magnetic Field

  • DOI: 10.1007/s11090-017-9831-9
  • Odkaz: https://doi.org/10.1007/s11090-017-9831-9
  • Pracoviště: Katedra fyziky
  • Anotace:
    We investigated nitrogen monoxide, nitrogen dioxide and ozone generation for corona-like dielectric barrier discharge in a stationary magnetic field with airflow. The magnetic field was produced by the permanent magnet. We showed that nitrogen monoxide could be easily generated at relatively low voltages, by application of a magnetic field on the hollow needle to mesh with a dielectric barrier discharge. For higher voltages generation of nitrogen monoxide falls to zero, and generation of nitrogen dioxide and ozone with increasing voltage increases. We also demonstrated that simultaneous application of the magnetic field with airflow through the needle electrode affects the transition of the discharge from the high to the low voltage regime. This transition is accompanied by important changes in the production of nitrogen oxides and ozone. Changes in the discharge regime are reflected by changes in the voltage-current waveforms. The obtained results could be interesting for various biomedical applications or bacterial decontamination of surfaces.

Effect of TiO2 on Various Regions of Active Electrode on Surface Dielectric Barrier Discharge in Air

  • DOI: 10.1007/s11090-016-9723-4
  • Odkaz: https://doi.org/10.1007/s11090-016-9723-4
  • Pracoviště: Katedra fyziky, Katedra elektrotechnologie, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    For surface dielectric barrier discharge in air, we examined the effect of titanium dioxide on various regions of the active electrode on the electrical parameters of discharge, on its emission spectra, and for demonstration of the obtained results also on the concentration of ozone produced by the discharge. We used the active electrode in the form of nine interconnected parallel strips and a square counter electrode. The TiO2 layer covered either only the strips, the region between the strips, or all active electrode. As reference discharge we used the discharge without any layer of TiO2. We found that direct application potential has a version when the strips of the active electrode are covered with a layer of TiO2, because the concentration of ozone produced by the discharge is the highest in all investigated cases. This finding could therefore be used for construction of more efficient ozone generators.

Experimental and modelling study of the effect of airflow orientation with respect to strip electrode on ozone production of surface dielectric barrier discharge

  • DOI: 10.1063/1.4966603
  • Odkaz: https://doi.org/10.1063/1.4966603
  • Pracoviště: Katedra fyziky, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    This study examines the effect of airflow orientation with respect to the strip active electrode on concentration of ozone and nitrogen dioxide produced in a planar generator based on the surface dielectric barrier discharge. The orientation of the airflow was tested in parallel and perpendicular with respect to the strips. It was found that in the investigated range of average discharge power, the ozone concentration increases approximately by 25% when airflow was oriented in parallel with respect to the strips in comparison with perpendicular orientation of the airflow. Similarly the increase of nitrogen dioxide concentration was observed for parallel orientation of the airflow with respect to the strips in comparison with the perpendicular orientation of the airflow. Within the range of wavelengths from 250 to 1100 nm, the changes of intensities of spectral lines associated with airflow orientation have been observed. A 3D numerical model describing ion trajectories and airflow patterns have also been developed.

Comparative study of TiO2 and ZnO photocatalysts for the enhancement of ozone generation by surface dielectric barrier discharge in air

  • DOI: 10.1016/j.apcata.2015.06.003
  • Odkaz: https://doi.org/10.1016/j.apcata.2015.06.003
  • Pracoviště: Katedra fyziky, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    We examined the possibility of finding an alternative to the photocatalyst titanium dioxide for enhancement of ozone generation by electrical discharges. As a rough indicator of the photocatalytic activity of the catalysts, we took the concentration of the ozone produced by the surface dielectric barrier electrical discharge in air. This discharge is, apart from the source of the charged and excited species, also the source of ultraviolet radiation, which could be used for the activation of photocatalysts. From various photocatalysts we have chosen zinc oxide. We compared the effect of ZnO and TiO2 on the enhancement of discharge ozone production and we found that for this application ZnO shows almost the same effect as TiO2 photocatalyst.

Effect of TiO2 and Reverse Air Supply on Ozone Production of Negative Corona Discharge with the Needle in the Dielectric Tube to Mesh Electrode System

  • DOI: 10.1007/s11090-015-9628-7
  • Odkaz: https://doi.org/10.1007/s11090-015-9628-7
  • Pracoviště: Katedra fyziky
  • Anotace:
    Ozone production using a hollow-needle-to-mesh negative corona discharge, with the needle electrode inserted in a dielectric tube, has been investigated. The air to the discharge could be supplied either through the needle electrode or reversely through the mesh electrode, which could additionally be covered with globules of TiO2 photocatalyst. The effects of these parameters on the electrical characteristics of the discharge, on ozone production and on the transition of the discharge from the glow to the streamer regime, have all been investigated. We found that reverse air supply substantially affects the electrical characteristics of the discharge when the needle electrode is inserted in the dielectric tube. Placement of TiO2 globules on the mesh decreases discharge voltage for a simple needle as well as for all positions of the needle inside the dielectric tube. The best performance from the standpoint of discharge ozone generation showed discharge with a supply of air through the needle electrode inserted in the dielectric tube with TiO2 globules on the mesh electrode.

Acoustic field effects on a negative corona discharge

  • DOI: 10.1088/0963-0252/23/3/035005
  • Odkaz: https://doi.org/10.1088/0963-0252/23/3/035005
  • Pracoviště: Katedra fyziky
  • Anotace:
    For a negative corona discharge under atmospheric pressure in different regimes, we investigated the effects of an acoustic field both on its electrical parameters and on the change in its visual appearance. We found that the application of an acoustic field on the true corona discharge, for particular currents, decreases the discharge voltage. The application of an acoustic field on the discharge in the filamentary streamer regime substantially extends the range of currents for which the discharge voltage remains more or less constant, i.e. it allows a substantial increase in the power delivered to the discharge. The application of an acoustic field on the discharge causes the discharge to spread within the discharge chamber and consequently, a highly reactive non-equilibrium plasma is created throughout the inter-electrode space. Finally, our experimental apparatus radiates almost no acoustic energy from the discharge chamber.

Acoustically Stabilized Edge to Wire Electrode Electrical Discharges

  • Pracoviště: Katedra fyziky
  • Anotace:
    We describe acoustical stabilization of the negative corona discharge in air with razor blade electrode against grounded wire electrode placed axially in a cylindrical resonator in the pressure node of the acoustic standing waves. When the standing waves are applied the discharge becomes more uniform and its volume is substantially increased along entire edge of the blade electrode. Images of the discharges for various acoustic field strengths are presented.

Ozone production of hollow-needle-to-mesh negative corona discharge enhanced by dielectric tube on the needle electrode

  • DOI: 10.1088/0963-0252/23/6/062001
  • Odkaz: https://doi.org/10.1088/0963-0252/23/6/062001
  • Pracoviště: Katedra fyziky
  • Anotace:
    For the hollow-needle-to-mesh negative corona discharge in air, we studied the effect of placing the dielectric tube on the needle electrode and the effect of various positions of the end of this tube with respect to the tip of the needle electrode on the concentration of ozone produced by the discharge, the ozone production yield and the discharge V –A characteristics. We found that the placement of the dielectric tube on the needle electrode with a suitable position of this tube end with respect to the tip of the needle electrode for a particular discharge power led to a more than fourfold increase in the concentration of ozone produced by the discharge and also, for a constant airflow, the ozone production yield.

Temperature-and airflow-related effects of ozone production by surface dielectric barrier discharge in air

  • DOI: 10.1140/epjd/e2014-50393-x
  • Odkaz: https://doi.org/10.1140/epjd/e2014-50393-x
  • Pracoviště: Katedra fyziky, Katedra ekonomiky, manažerství a humanitních věd
  • Anotace:
    For the surface dielectric barrier discharge in air we investigated the effect of temperature and various arrangements of the input and output of the feeding gas of the discharge chamber together with related changes of electrical parameters on the discharge ozone production for the temperatures in which commercial ozone generators function. The obtained results are useful for the construction of commercial ozone generators because they show the importance of temperature as well as airflow patterns in the discharge chamber on the electrical parameters of the discharge and on its ozone production.

Asymmetric properties and ozone production of surface dielectric barrier discharge with different electrode configurations

  • DOI: 10.1140/epjd/e2013-30723-4
  • Odkaz: https://doi.org/10.1140/epjd/e2013-30723-4
  • Pracoviště: Katedra fyziky
  • Anotace:
    For two electrode configurations of SDBD we investigated the asymmetry of the electrical parameters for the positive and negative half-periods of the discharge voltage. This asymmetry is caused by different micro-discharges activity, which is reflected by peaks in the discharge current waveforms. We also found that discharge ozone production is affected by this asymmetry.

Effect of magnetic field, airflow or combination of airflow with magnetic field on hollow needle-to-cylinder discharge regimes

  • DOI: 10.1088/0022-3727/46/50/505207
  • Odkaz: https://doi.org/10.1088/0022-3727/46/50/505207
  • Pracoviště: Katedra fyziky
  • Anotace:
    For the hollow needle-to-cylinder dc discharge in air at atmospheric pressure we studied the effect of magnetic field, airflow and combination of airflow with magnetic field on transitions between various discharge regimes. We showed that application of magnetic field on the discharge in static air does not substantially change the discharge characteristics. In contrast with this finding, application of airflow through the needle increases the range of current of the discharge pulseless regime in comparison with the discharge in static air. A similar but more significant effect was obtained for combination of the airflow and magnetic field on the discharge. It was also shown that for the discharge in static air, discharge in static air in magnetic field, discharge with airflow and discharge in magnetic field with airflow for the filamentary streamer regime, the duration of the discharge voltage pulses decreases with increasing current. Using the combination of the airflow and magnetic field we were therefore able to stabilize the discharge and to increase the volume of the discharge chamber occupied by the non-equilibrium plasma.

Experimental study of surface dielectric barrier discharge in air and its ozone production

  • DOI: 10.1088/0022-3727/45/7/075201
  • Odkaz: https://doi.org/10.1088/0022-3727/45/7/075201
  • Pracoviště: Katedra fyziky
  • Anotace:
    For surface dielectric barrier discharge in air we studied the effects of frequency of the driving voltage on dissipated power, asymmetry of amplitudes of the discharge voltage, discharge UV emission, ozone production, ozone production of the discharge with TiO2 and of the discharge in magnetic field. We found that intensity of the discharge UV emissions for wavelengths of 320-420 nm is for both frequencies a linear function of power; maximum ozone concentration for the frequency of the driving voltage of 26.3 kHz is obtained with smaller power than for the frequency of 10.9 kHz; placement of TiO2 particles into the discharge chamber increases for both frequencies of the driving voltage maximum ozone concentration produced by the discharge and for the frequency of the driving voltage of 26.3 kHz increases ozone production yield. Finally there is no observable effect of magnetic field on concentration of ozone produced by the discharge as well as on production yield.

Ozone production using a power modulated surface dielectric barrier discharge in dry synthetic air

  • DOI: 10.1007/s11090-012-9382-z
  • Odkaz: https://doi.org/10.1007/s11090-012-9382-z
  • Pracoviště: Katedra fyziky
  • Anotace:
    The measurements of electrical and optical characteristics of the discharge and concentrations of produced ozone and nitrogen oxides were performed to evaluate the efficiency of ozone production in an AC surface dielectric barrier discharge (SDBD) in dry synthetic air at atmospheric pressure. The discharge was driven in an amplitude-modulated regime with driving AC frequencies of 1, 5 and 10 kHz, variable discharge duty cycle of 0.02-0.8 and air flow rate of 2-10 slm. The highest calculated ozone production yield reached ~ 90 g/kWh with a corresponding energy cost of about 20 eV/molecule.

Atmospheric Air Needle to Cylinder DC Discharges in Magnetic Field

  • DOI: 10.1109/TPS.2011.2129529
  • Odkaz: https://doi.org/10.1109/TPS.2011.2129529
  • Pracoviště: Katedra fyziky
  • Anotace:
    We investigated the effect of a magnetic field on atmospheric air DC discharges in cylindrical configuration. We found that for the negative corona discharge in a streamer regime application of the magnetic field causes rotation of streamers around the axis of the discharge chamber, spreading of the discharge and consequently its homogenization. Similar results were obtained for the atmospheric pressure glow discharge.

Effect of catalysts location on performance of DC corona discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    The processes of ozone and nitrogen oxides production by DC corona discharge can be affected by location of catalysts in the discharge chamber. For the DC hollow needle to mesh corona discharge enhanced by the flow of air through the needle electrode we studied the effect of location of TiO2 or ZMS-5 catalysts on the mesh electrode on ozone and nitrogen monoxide/dioxide production. We found that production of NO2 is strongly influenced by the position of any of these catalysts on the mesh electrode.

Effect of Catalysts on DC Corona Discharge Poisoning

  • DOI: 10.1140/epjd/e2010-10246-4
  • Odkaz: https://doi.org/10.1140/epjd/e2010-10246-4
  • Pracoviště: Katedra fyziky
  • Anotace:
    The term poisoning refers to the situation when the discharge ozone formation completely breaks down. This effect can be affected by placing various catalysts in the discharge chamber. We studied the effect of titanium dioxide TiO2, ZSM-5 zeolite or Cu++ZSM-5 zeolite on discharge poisoning by monitoring the ozone, nitrogen monoxide and nitrogen dioxide discharge production. We found that energy density of the onset of discharge poisoning is smallest for a discharge with TiO2.

Ozone generation by surface dielectric barrier discharge with TiO2

  • Pracoviště: Katedra fyziky
  • Anotace:
    The objective of our work was to investigate experimentally ozone production of the surface dielectric barrier discharge in synthetic air without and with titanium dioxide TiO2 photocatalyst in the discharge chamber. We found that addition of TiO2 into the discharge chamber not only increases concentration of ozone produced by the discharge, but for small values of discharge power almost two times increases ozone production yield. The experiments were performed for the frequency of the driving voltage 11 kHz

Air-Jet Power Ultrasonic Field Applied to Electrical Discharge

  • DOI: 10.1016/j.phpro.2010.01.099
  • Odkaz: https://doi.org/10.1016/j.phpro.2010.01.099
  • Pracoviště: Katedra fyziky
  • Anotace:
    We describe a new setup of the Hartmann air-jet ultrasonic generator combined with electrical discharge in the nozzle-resonator gap. Using the schlieren visualization of air jet and ultrasonic field we investigated the shape and structure of the discharge and we determined relationship among the acoustic field in the nozzle-resonator gap, generator ultrasonic emission and discharge behavior.

DC Corona discharge ozone production enhanced by magnetic field

  • DOI: 10.1140/epjd/e2009-00276-4
  • Odkaz: https://doi.org/10.1140/epjd/e2009-00276-4
  • Pracoviště: Katedra fyziky
  • Anotace:
    Enhancement of ozone production from air by a corona discharge can be achieved by a magnetic field. We found that application of a stationary magnetic field on a corona discharge increases its ozone production without any additional energy requirements.

Effect of the magnetic field on electrical characteristics of the dc corona discharge

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Book of Contributed Papers. Bratislava: Comenius University Bratislava, 2010. pp. 561-564. ISBN 978-80-89186-71-6.
  • Rok: 2010
  • Pracoviště: Katedra fyziky
  • Anotace:
    Stationary magnetic field affects electrical characteristics of the dc corona discharge.

Influence of Power Modulation on Ozone Production Using an AC Surface Dielectric Barrier Discharge in Oxygen

  • DOI: 10.1007/s11090-010-9245-4
  • Odkaz: https://doi.org/10.1007/s11090-010-9245-4
  • Pracoviště: Katedra fyziky
  • Anotace:
    The measurements of electro-optical discharge characteristics and the concentration of produced ozone were performed to evaluate the efficiency of ozone production in an AC surface dielectric barrier discharge (SDBD) in pure oxygen at atmospheric pressure. The highest ozone production yield reached 170 g/kWh.

Non traditional approaches leading to enhanced ozone generation

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Book of Contributed Papers. Bratislava: Comenius University Bratislava, 2010. pp. 287-290. ISBN 978-80-89186-71-6.
  • Rok: 2010
  • Pracoviště: Katedra fyziky
  • Anotace:
    Using the catalysts or other fields it is possible to enhance generation of ozone by electrical discharges.

Effect of Polarity and Photocatalyst on DC Corona Discharge Ozone Production

  • Pracoviště: Katedra fyziky
  • Anotace:
    We studied the effect of polarity and photocatalyst TiO2 on DC corona discharge ozone production. For the discharge with mesh without TiO2 the discharge with the needle positive is more efficient source of ozone than the discharge with the needle negative. For particular energy density addition of TiO2 on the mesh electrode increases discharge ozone production for both polarities of the coronating electrode. This effect is however stronger for the needle negative.

Hartmann Ultrasound Generator Combined with Electrical Discharge

  • DOI: 10.1109/ULTSYM.2009.5441514
  • Odkaz: https://doi.org/10.1109/ULTSYM.2009.5441514
  • Pracoviště: Katedra fyziky
  • Anotace:
    We describe a new setup of the Hartmann gas-jet ultrasonic generator combined with the electrical discharge with reduced gas flow rate. Our idea involves a rod along the nozzle-resonator axis. New nozzle construction also enables to control electric field in the nozzle-resonator gap and creates high power ultrasoud field in volume in front of the resonator. Apart of the fact that the discharge is stabilized along the resonator orifice circumference, it becomes more uniform and it increases its volume.

DC Corona Ozone Generation Enhanced by TiO2 Photocatalyst

  • DOI: 10.1140/epjd/e2008-00216-x
  • Odkaz: https://doi.org/10.1140/epjd/e2008-00216-x
  • Pracoviště: Katedra fyziky
  • Anotace:
    Electrical discharges in air at atmospheric pressure are sources of ozone, other oxygen based reactive species and also ultraviolet radiation. We studied the role of this radiation on discharge ozone production by placing TiO2 photocatalyst into the discharge region. We found that for the negative corona addition of TiO2 into the discharge chamber increases discharge ozone production.

Innovative Advanced Oxidation Processes for Organic Micropollutants

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2008. Praha: Czech Technical University in Prague, 2008. pp. FYZ008-FYZ2008. ISBN 978-80-01-04016-4.
  • Rok: 2008
  • Pracoviště: Katedra fyziky
  • Anotace:
    Advanced Oxidation Processes. Organic Micropollutants

Některé ekologické aspekty elektrických výbojů za atmosférického tlaku

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Podzimní škola, 12. ročník. Praha: ČVUT FEL, Katedra fyziky, 2008. pp. 151-158. ISBN 978-80-01-04195-6.
  • Rok: 2008
  • Pracoviště: Katedra fyziky
  • Anotace:
    Netermální plazma generované elektrickými výboji za atmosférického tlaku lze používat k rozkladu těkavých uhlovodíků, toxických látek, pro snižování aerodynamického odporu křídla letadla a tudíž spotřeby paliva nebo při intenzifikaci procesů spalování (plynárenství, energetika). Ve všech těchto případech z hlediska ekologie klíčovou roli hraje skutečnost, že energie dodaná do výboje je využita pro generaci netermálního plazmatu a není spotřebovávána na ohřev samotného plynu.

Ozone production by a DC corona discharge in air contaminated by n-heptane

  • DOI: 10.1088/0022-3727/41/2/025204
  • Odkaz: https://doi.org/10.1088/0022-3727/41/2/025204
  • Pracoviště: Katedra fyziky
  • Anotace:
    Beneficial purposes of ozone such as elimination of odors, destroying bacteria and mildew can be used for transportation of food, fruits and vegetables with the aim to extend their storage life. At present combination of cooling together with the supply of ozone into containers with these commodities is considered. We studied the effect of air contamination by n-heptane (part of automotive fuels) on ozone production by DC corona discharge. We found that addition of n-heptane to air decreases ozone production and causes the discharge poisoning to occur at lower current than for air.

Ultrasonic Field Effects on Corona Discharge in Air

  • DOI: 10.1109/TPS.2008.920222
  • Odkaz: https://doi.org/10.1109/TPS.2008.920222
  • Pracoviště: Katedra fyziky
  • Anotace:
    The application of ultrasonic waves on corona discharge causes existence of pressure gradients in the discharge gap. According to Meek´s criterion formation of streamers in the discharge and therefore the discharge profile is affected by these pressure gradients. We calculated the distribution of ultrasonic pressure in the interelectrode gap and we demonstrated experimentally that the discharge profile is affected by this ultrasonically induced pressure distribution.

Volatile Organic Compounds Decomposition and Role of Ozone in Decomposition Process

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2008. Praha: Czech Technical University in Prague, 2008. pp. FYZ001. ISBN 978-80-01-04016-4.
  • Rok: 2008
  • Pracoviště: Katedra fyziky
  • Anotace:
    Volatile organic compounds. Decomposition process. Ozone.

Atmospheric-pressure DC corona discharge in N2-NO mixtures: efficiency and energy cost of nitric oxide removal

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Šimek, M.
  • Publikace: Proceedings of XXVIII International Conference on Phenomena in Ionized Gases. Prague: Institute of Plasma Physics AS CR, v.v.i., 2007. pp. 1449-1452. ISBN 978-80-87026-01-4.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper focuses on de-NOX efficiency of the DC atmospheric pressure positive corona discharge enhanced by the flow of the mixture of nitrogen with traces of NO. The experimental findings indicate that the transformation of nitric oxide is controlled by the production of atomic nitrogen. For a particular energy density the NO decomposition increases with flow rate and higher NO removal is obtained for lower initial NO concentrations.

Decomposition of Volatile Organic Compounds by Plasma Enhanced Photocatalyst

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2007. Praha: České vysoké učení technické v Praze, 2007. pp. FYZ020-Fyz020. ISBN 978-80-01-03667-9.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    Decomposition of Volatile Organic Compounds by Plasma Enhanced Photocatalyst

Elektrické výboje za atmosférického tlaku

  • Pracoviště: Katedra fyziky
  • Anotace:
    Elektrické výboje za atmosférického tlaku

Experimental Studies Leading to Enhanced de-NOx Processes in Non-Equilibrium Atmospheric Pressure Discharges

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2007. Praha: České vysoké učení technické v Praze, 2007. pp. FYZ0026-FYZ026. ISBN 978-80-01-03667-9.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    De-NOx Processes in Non-Equilibrium Atmospheric Pressure Discharges

Non-thermal plasma decomposition of volatile organic compounds - influence of ozone

  • Pracoviště: Katedra fyziky
  • Anotace:
    This work was focused on the study of the role of ozone on n-heptane decomposition efficiency. It was found that ozone is involved in n-heptane decomposition for low energy densities, while for higher energy densities the discharge is practically in the state of discharge poisoning. Thus for higher energy densities the n-heptane decomposition can be attributed mainly to the presence of OH radicals.

Non-Thermal Plasma Ecological Applications

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Pospíšil, M., Leys, C.
  • Publikace: Proceedings of Workshop 2007. Praha: České vysoké učení technické v Praze, 2007. pp. FYZ015. ISBN 978-80-01-03667-9.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    Non-Thermal Plasma Ecological Applications

Non-thermal plasma n-heptane decomposition enhanced by supplementary addition of active species

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of XXVIII International Conference on Phenomena in Ionized Gases. Prague: Institute of Plasma Physics AS CR, v.v.i., 2007. pp. 1289-1292. ISBN 978-80-87026-01-4.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    We investigated the increase of n-heptane decomposition by the hollow needle to mesh electrical discharge with a layer of TiO2 photocatalyst on the mesh when additional ozone and other active species were supplied to the discharge. In this way we were able to increase the n-heptane decomposition efficiency from 47 % to 53 %.

Ozone interaction with a stainless steel and a PtRhPd/Al2O3 honeycomb catalyst

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J., Khun, J., Pospíšil, M.
  • Publikace: Proceedings of XXVIII International Conference on Phenomena in Ionized Gases. Prague: Institute of Plasma Physics AS CR, v.v.i., 2007. pp. 1367-1370. ISBN 978-80-87026-01-4.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    We studied ozone decomposition by a stainless steel and by a PtRhPd/Al2O3 honeycomb catalyst. It was found that in case of stainless steel chamber ozone decomposition does not substantially depend on temperature. Contrary to this in case of the chamber with PtRhPd/Al2O3 catalyst ozone decomposition is strongly influenced by the temperature.

Ultrasonic Resonator with Electrical Discharge Cell for Ozone Generation

  • Pracoviště: Katedra fyziky
  • Anotace:
    The effect of ultrasound waves in an ultrasonic resonator cell on ozone generation by a hollow needle to plate electrical discharge enhanced by the airflow through the needle is experimentally investigated. It was found that the application of ultrasound waves increases ozone generation for discharge when the needle is negatively biased, and has no effect on ozone generation for the discharge when the needle is biased positively. We try to explain the influence of ultrasound on the discharge mechanisms.

De-NOx Efficiency of Positive/Negative DC Corona Discharge: a Comparative Study

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Šimek, M., Khun, J.
  • Publikace: Proceedings of the XVI-th International Conference on Gas Discharges and their Applications. Xi´an: Xi´an Jiaotong University, 2006. pp. 533-536. ISBN 0-9539105-3-9.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    De-NOx efficiency, DC corona discharge

Dynamic Characteristics of Positive Hollow Needle to Plate Atmospheric Pressure Discharge

  • Autoři: Khun, J., prof. Ing. Stanislav Pekárek, CSc., Šimek, M., Schmidt, J.
  • Publikace: Czechoslovak Journal of Physics. 2006, 56(Suppl.B), 830-836. ISSN 0011-4626.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Electrical discharge, dynamic characteristics

Effect of Humidity and Ozone on n-Heptane Decomposition by Atmospheric Pressure Electrical Discharge with and without Photocatalyst TiO2

  • Pracoviště: Katedra fyziky
  • Anotace:
    VOC decompoosition, electrical discharge, photocatalyst

Effect of ultrasound waves on a hollow needle to plate electrical discharge in air or mixture of air with VOCs

  • Pracoviště: Katedra fyziky
  • Anotace:
    Ultrasound, electrical discharge, VOC

Gas Flow Enhanced DC Corona Discharge for de-NOx Processes in N2-NOx Mixtures

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2006. Praha: České vysoké učení technické v Praze, 2006. pp. 46-47. ISBN 80-01-03439-9.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    DC corona discharge, N2-NOx mixtures

Non Thermal Plasma at Atmospheric Pressure for Ozone Generation and VOC Decomposition

  • Pracoviště: Katedra fyziky
  • Anotace:
    Non Thermal Plasma, Ozone Generation, VOC Decomposition

Non-Thermal Plasma and TiO2 Assisted n-Heptane Decomposition

  • Pracoviště: Katedra fyziky
  • Anotace:
    VOC decomposition, non-thermal plasma, photocatalyst

Non-Thermal Plasma Enhanced PtRhPd/Al2O3 Honeycomb Catalyst for n-Heptane Decomposition

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Khun, J., Pospíšil, M.
  • Publikace: Proceedings of the XVI-th International Conference on Gas Discharges and their Applications. Xi´an: Xi´an Jiaotong University, 2006. pp. 489-492. ISBN 0-9539105-3-9.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Non-Thermal Plasma, Catalyst, n-Heptane Decomposition

Optical and electrical characteristics of hollow needle to plate atmospheric pressure discharge in nitrogen

  • Autoři: Šimek, M., Schnmidt, J., prof. Ing. Stanislav Pekárek, CSc., Khun, J.
  • Publikace: Bulletin of The American Physical Society. 2006, 51(5), 27. ISSN 0003-0503.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Electrical discharge, diagnostics

Polarity Effects of DC Corona Discharge

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Khun, J.
  • Publikace: Proceedings of Workshop 2006. Praha: České vysoké učení technické v Praze, 2006. pp. 50-51. ISBN 80-01-03439-9.
  • Rok: 2006

Power ultrasound interaction with DC atmospheric pressure electrical discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    The effect of power ultrasound application on DC hollow needle to plate atmospheric pressure electrical discharge enhanced by the flow of air through the needle electrode was studied experimentally. It was found that applying ultrasound increases discharge volume. In this volume take place plasmachemical processes, used in important ecological applications such as the production of ozone, VOC decomposition and de-NOx processes enhancement.

The Effect of Ultrasound on Hollow-Needle to Plate Electrical Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    The effect of ultrasound standing waves at a frequency of 20.3 kHz on hollow-needle to plate electrical discharge enhanced by the flow of air through the needle is described. It was found that the suitable application of ultrasound increases discharge volume in cylindrical one wavelength ultrasonic resonator excited by solid piston with only a slightly smaller diameter than the resonator diameter. This discharge-spread is connected with radial pressure distribution as a result of ultrasound interaction with the airflow from the needle. Efficient mixing in infinitesimal layer of the air created along vibrating electrode and other complex processes, which are caused by electrical and aerodynamic interactions can be used for environmental applications such as production of ozone, VOC decomposition and de-NOx processes enhancement.

Ultrasound and Airflow Induced Thermal Instability Suppression of DC Corona Discharge: an Experimental Study

  • Pracoviště: Katedra fyziky
  • Anotace:
    Thermal instability, electrical discharge, ultrasound, airflow

Výzkum na katedře fyziky elektrotechnické fakulty ČVUT

Effect of N2-NO Mixture Composition on Basic Electrical Characteristics of Hollow Needle to Plate Atmospheric Pressure Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    Electrical discharge, electrical characteristics

Experimental Study of De-NOx Processes in Non-Equilibrium Electrical Discharges

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2005. Praha: České vysoké učení technické v Praze, 2005. pp. 166-167. ISBN 80-01-03201-9.
  • Rok: 2005

Hybrid Plasmachemical System for VOC Decomposition

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2005. Praha: České vysoké učení technické v Praze, 2005. pp. 164-165. ISBN 80-01-03201-9.
  • Rok: 2005

Mechanism of Gas Flow Enhanced DC Corona Discharge

Nitric Oxide Decomposition by Hollow-Needle to Plate Atmospheric Discharge in N2-NO Mixtures

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Šimek, M.
  • Publikace: Proceeeings of the 17th International Symphosium on Plasma Chemistry. Toronto: University of Toronto, 2005. pp. 1-6.
  • Rok: 2005

Plasma Technologies for Ecological Applications

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Khun, J.
  • Publikace: Proceedings of Workshop 2005. Praha: České vysoké učení technické v Praze, 2005. pp. 72-73. ISBN 80-01-03201-9.
  • Rok: 2005
  • Pracoviště: Katedra fyziky
  • Anotace:
    Plasma, ecological applications

Plazmové technologie pro ekologické aplikace

Two hollow needles to mesh electrical discharge with TiO2 catalyst for VOC decomposition

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Neirynck, D., Leys, C., Pospíšil, M., Krýsa, J.
  • Publikace: Proceeeings of the 17th International Symphosium on Plasma Chemistry. Toronto: University of Toronto, 2005. pp. 1-5.
  • Rok: 2005

Ultrasound Induced Thermal Instability Suppression of Electrical Discharge for Ecological Applications

  • Pracoviště: Katedra fyziky
  • Anotace:
    Thermal instability, ultrasound

Effect of ultrasound waves on electrical characteristics of hollow needle to plate electrical discharge in air or in mixture of air with VOC

  • Pracoviště: Katedra fyziky
  • Anotace:
    Elektrický výboj, ultrazvuk, těkavé uhlovodíky

Gas flow effects on ozone production by hollow needle to plate electrical discharge

Gas Flow Enhanced Hollow Needle to Plate Electrical Discharge for Decomposition of Volatile Organic Compounds

N-heptane Decomposition by Non-Thermal Electrical Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    Elektrický výboj, rozklad těkavých uhlovodíků

Optical Diagnostics of the Hollow Needle to Plate Discharge in Air

  • Pracoviště: Katedra fyziky
  • Anotace:
    Emission spectroscopy, electrical discharge

Ozone Generation by Hollow Needle to Plate Electrical Discharge in Ultrasound Field

  • Pracoviště: Katedra fyziky
  • Anotace:
    Ozone, Electrical Discharge, Ultrasound

Ozone Generation Enhanced by Ultrasound Waves in Hollow Needle to Plate Electrical Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    Ozone, Electrical Discharge, Ultrasound Waves

Ozone Generation from Two Hollow Needles to Plate Electrical Discharges Enhanced by Airflow

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J., Khun, J.
  • Publikace: Proceedings of 12th International Congress on Plasma Physics. Paris: CEA, 2004. pp. x-y.
  • Rok: 2004

Ozone Production by Non-Thermal Electrical Discharges

Relationship between rotational temperature and energy density in atmospheric pressure hollow needle to plate electrical discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    Elektrický výboj, rotační teplota

Efficiency of ozone production in non-thermal plasma electrical discharges in synthetic air - comparative study

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Šimek, M., Člupek, M., Šimor, M., Ráhel, J., Černák, M.
  • Publikace: ISPC 16 Contributed papers CD-ROM. Bari: Institute for Inorganic Methodology and Plasma, 2003. pp. 1-6.
  • Rok: 2003

Generation of Ozone by Electrical Discharges

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J.
  • Publikace: Proceedings of Workshop 2003 (online). Praha: České vysoké učení technické v Praze, 2003. pp. 158-159. ISBN 80-01-02708-2.
  • Rok: 2003
  • Pracoviště: Katedra fyziky
  • Anotace:
    Generace ozonu elektrickým výbojem

Generation of Ozone by Electrical Discharges

  • Autoři: Rosenkranz, J., prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2003. Praha: České vysoké učení technické v Praze, 2003. pp. 158-159. ISBN 80-01-02708-2.
  • Rok: 2003
  • Pracoviště: Katedra fyziky
  • Anotace:
    Generace ozonu v netermálním plazmatu

N-heptane decomposition in multi-needle to plate electrical discharge

Non Thermal Plasma Ozone Generation

Non Thermal Plasma Technologies for VOC Decomposition

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2003. Praha: České vysoké učení technické v Praze, 2003. pp. 62-63. ISBN 80-01-02708-2.
  • Rok: 2003
  • Pracoviště: Katedra fyziky
  • Anotace:
    Rozklad těkavých uhlovodíků

Non-Thermal Plasma Technologies for VOC Decomposition

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of Workshop 2003 (online). Praha: České vysoké učení technické v Praze, 2003. pp. 62-63. ISBN 80-01-02708-2.
  • Rok: 2003
  • Pracoviště: Katedra fyziky
  • Anotace:
    Rozklad těkavých uhlovodíků

Electrical Discharge Enhanced by Gas Flow for Ozone Generation and VOC Decomposition

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Kříha, V., Rosenkranz, J.
  • Publikace: Proceedings of Workshop 2002. Praha: České vysoké učení technické v Praze, 2002. pp. 66-67. ISBN 80-01-02511-X.
  • Rok: 2002
  • Pracoviště: Katedra fyziky
  • Anotace:
    Generation of Ozone and VOC Decomposition

Multi Hollow Needle to Plate Electrical Discharge in Mixture of Air with n-heptane

  • Autoři: prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Proceedings of the 14th International Conference on Gas Discharges and their Applications. Liverpool: GD2002 Local Organizing Committee, 2002. pp. 80-83. ISBN 0-9539105-1-2.
  • Rok: 2002
  • Pracoviště: Katedra fyziky
  • Anotace:
    Studium výboje v konfiguraci duté jehly-rovina

Ozone and Nitrogen Oxides Generation in Gas Flow Enhanced Hollow Needle to Plate Discharge in Air

  • Pracoviště: Katedra fyziky
  • Anotace:
    Ozone and Nitrogen Oxides Generation

Toluene and n-heptane decomposition by multi-hollow needle to plate electrical discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    VOC non-therrmal plasma decomposition.

Application of plasma techniques for exhaust aftertreatment

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Pospíšil, M., Viden, I., Šimek, M.
  • Publikace: International Journal of Vehicle Design. 2001, 27(1-4), 306-313. ISSN 0143-3369.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Plasma, environmental protection

Hollow Needle to Plate Electrical Discharge Enhanced by Gas Flow

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Kříha, V., Rosenkranz, J., Hanitz, F.
  • Publikace: Proceedings of Workshop 2001. Praha: České vysoké učení technické v Praze, 2001. pp. 50-51. ISBN 80-01-02335-4.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Všeobecný popis speciálního typu výboje

Multi Hollow Needle to Plate Plasmachemical Reactor for Pollutant Decomposition

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Kříha, V., Pospíšil, M., Viden, I.
  • Publikace: Journal of Physics D: Applied Physics. 2001, 34(22), 117-121. ISSN 0022-3727.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Non thermal plasma decomposition of volatile hydrocarbons

Ozone Generation in Gas Flow Enhanced Hollow Needle to Plate Discharge in Air

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Kříha, V., Rosenkranz, J., Mason, N.
  • Publikace: Proceedings of the 15th Ozone World Congress. London: International Ozone Association, 2001. pp. 57-64.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Study of ozone generation and erosion of electrodes

Ozone Production Efficiency of Non Thermal Electrical Discharges - Comparative Study

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Šimek, M., Kříha, V., Rosenkranz, J., Člupek, M.
  • Publikace: 15 International Symposium on Plasma Chemistry Symposium Proceedings. Orleans: Organizing Committees of the 15 International Symposium on Plasma Chemistry, 2001. pp. 3115-3120.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Experimental study of hollow needle and corona discharge

Application of Plasma Techniques for Exhaust Aftertreatment

  • Autoři: Pospíšil, M., Víden, I., prof. Ing. Stanislav Pekárek, CSc., Šimek, M.
  • Publikace: 9th International Symposium "Transport and Air Pollution". Contributed Papers. Avignon: INRETS, 2000. pp. 523-528. ISBN 2-85782-533-1.
  • Rok: 2000

DC Electrical Discharge in Hollow Needle-to-Plane Electrode Configuration at Atmospheric Pressure

GC-MS Analysis of Products from Degradation of Toluene Vapors by Electrical Discharge

  • Autoři: Víden, I., Pospíšil, M., Janda, V., prof. Ing. Stanislav Pekárek, CSc., Šimek, M.
  • Publikace: 23rd International Symposium on Capillary Chromatography Contributed papers. Torino: IMEKO, 2000. pp. j13.
  • Rok: 2000

Hollow Needle to Plate Electrical Discharge Enhanced by Gas Flow

Možnosti využití nízkoteplotní plazmy pro snižování emisí škodlivin z provozu motorových vozidel

  • Autoři: Víden, I., Pospíšil, M., Šimek, M., prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: 10. odborná konference "Znečištění ovzduší a zdraví". Praha: Sdružení pro ochranu kvality ovzduší, 2000. pp. 28-32.
  • Rok: 2000

Možnosti využití nízkoteplotní plazmy pro snižování emisí škodlivin z provozu motorových vozidel

Multineedle-to-Plane Corona Discharge

  • Autoři: Aubrecht, L., prof. Ing. Stanislav Pekárek, CSc., Koller, J., Staněk, Z.
  • Publikace: Proceedings of the HAKONE VII. Greifswald: TU Greifswald, 2000. pp. 73-76.
  • Rok: 2000

Netermální plazmatické metody rozkladu škodlivin

Ozone Generation in Gas Flow Enhanced Hollow Needle to Plate Electrical Discharge

Využití elektrických výbojů při snižování emisí škodlivin ze stacionárních a mobilních zdrojů

  • Autoři: Pospíšil, M., Víden, I., Šimek, M., prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: Moderní technologie čištění odpadních plynů. Praha: KONEKO, 2000. pp. 125-127. ISBN 80-238-4.
  • Rok: 2000

Vyzařování elektromagnetických vln z elektrických výbojů za atmosférického tlaku

Atmospheric Pressure Hollow Needle to Plate Electrical Discharge in Nitrogen

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Šimek, M., Kříha, V., Hanitz, F.
  • Publikace: Proceedings Contributed Papers XXIV ICPIG. Warsaw: IPPLM, 1999. pp. 125-126.
  • Rok: 1999
  • Pracoviště: Katedra fyziky
  • Anotace:
    Studium emisnich spekter výboje stabilizovaného prouděním dusíku

Atmospheric Pressure Hollow Needle to Plate Electrical Discharge in Nitrogen and Air

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Kříha, V., Šimek, M.
  • Publikace: Proceedings 14th International Symposium on Plasma Chemistry. Praha: AV ČR, Ústav fyziky plazmatu, 1999. pp. 1003-1008. ISBN 80-902724-2-8.
  • Rok: 1999

Elektrický výboj za atmosférického tlaku v konfiguraci dutá jehla-rovina

  • Autoři: Kříha, V., prof. Ing. Stanislav Pekárek, CSc.,
  • Publikace: 13. konferencia slovenských a českých fyzikov: Zborník abstraktov. Bratislava: Slovenská fyzikálna spoločnosť, 1999. pp. 16.
  • Rok: 1999

Hollow Needle-to-Plate Electrical Discharge at Atmospheric Pressure

  • DOI: 10.1088/0963-0252/8/3/321
  • Odkaz: https://doi.org/10.1088/0963-0252/8/3/321
  • Pracoviště: Katedra fyziky
  • Anotace:
    Typical sources of non-equilibrium plasmas are barrier discharge, direct current (DC) or alternating current (AC) gliding arc, pulsed or DC corona and DC atmospheric pressure discharge stabilized by a fast gas flow (APD-GFS). In case of APD-GFS the gas flows in a rectangular channel, the top wall of which serves as the anode and the multi-needle cathode is built into the bottom wall of the channel. In order to prevent the transition to a spark and to stabilize this type of discharge the velocity of the gas should be about 100-200 m s-1 or the discharge current must be limited. To avoid the problem connected with the acceleration of the primary (polluted) gas at such a velocity, the external flow of the primary gas around the needle electrodes can be superimposed by a flow of a secondary gas through the needles. Thus the primary gas need not be accelerated to high velocity and in order to stabilize the discharge a relatively small amount of a secondary gas supplied through the needle is required. This work is therefore focused on the study of the DC APD-GFS in hollow needle-to-plane geometry. The basic electrical characteristics, magnetic noise and integral emission spectra of this type discharge with the flow of nitrogen or air through the needle are given.

Internally Cooled Needle to Plate Electrical Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    Netermální plasmatické technologie pro ekologii

Magnetic Noise of Atmospheric Corona Discharge

Magnetic Noise of Atmospheric Pressure Electrical Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    Magnetický šum elektrického výboje při atmosférickém tlaku

Needle-to Plate Electrical Discharge at Atmospheric Pressure for Ecological Applications

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Kříha, V., Rosenkranz, J., Hanitz, F.
  • Publikace: 1998 ICPP Contributed Papers. Eindhoven: European Physical Society, 1998. pp. 2722-2725.
  • Rok: 1998
  • Pracoviště: Katedra fyziky
  • Anotace:
    Netermální plasma může být použito pro rozklad škodlivých látek

Professor Janča Anniversary - Personal Account

Atmospheric Pressure Electric Discharge in Fast Flowing Air

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J., Hanitz, F., Kříha, V.
  • Publikace: Proceedings Contributed Papers XXIII ICPIG. Toulouse: Université Paul Sabatier, 1997. pp. 226-227.
  • Rok: 1997

Breakdown Voltage of the Surface Glow Discharge

Electical Characterics of a Discharge in Fast Flowing Air

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J., Hanitz, F., Kříha, V.
  • Publikace: Proceedings of 18th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1997. pp. 203-205. ISBN 80-01-01641-2.
  • Rok: 1997

2-D Particle Simulation of the Glow Discharge

Elektrický výboj za atmosférického tlaku v rychle proudícím prostředí

  • Autoři: Kříha, V., Hanitz, F., prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J.
  • Publikace: Proceedings of the 9th Regional Conference IUAPPA - 3rd International Conference, Environmental Impact Assessment, Vol.2. Praha: České vysoké učení technické v Praze, 1996. pp. 335-338. ISBN 80-01-01514-9.
  • Rok: 1996
  • Pracoviště: Katedra fyziky
  • Anotace:
    ekologie, plazma, životní prostředí

Experimental Study of NO Generation in Electric Discharge

  • Autoři: Kříha, V., Hanitz, F., prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J.
  • Publikace: Workshop 96. Praha: České vysoké učení technické v Praze, 1996. pp. 101-102.
  • Rok: 1996

Atmospheric Pressure Glow Discharge in Air Flow for Ecological Applications

  • Autoři: Rosenkranz, J., prof. Ing. Stanislav Pekárek, CSc., Kříha, V.
  • Publikace: Workshop 95. Praha: České vysoké učení technické v Praze, 1995. pp. 87-88.
  • Rok: 1995

Electric Discharge in Air Flow at Atmospheric Pressure

  • Autoři: Rosenkranz, J., prof. Ing. Stanislav Pekárek, CSc., Hanitz, F., Kříha, V.
  • Publikace: 17th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1995. pp. 322-334. ISBN 80-01-01344-8.
  • Rok: 1995

Elektrotechnika a životní prostředí

Numerical Modelling of the Surface Glow Discharge

Numerical Modelling of the Surface Glow Discharge

Breakdown Voltage of the Surface Glow Discharge in Small Volume

  • Autoři: Rosenkranz, J., prof. Ing. Stanislav Pekárek, CSc., Žáček, M.
  • Publikace: Workshop 93. Praha: České vysoké učení technické v Praze, 1993. pp. 87-88.
  • Rok: 1993

Electrical Discharges for Ecological Applications

Elektrické výboje pro ekologické aplikace

  • Autoři: prof. Ing. Stanislav Pekárek, CSc., Rosenkranz, J.
  • Publikace: Proceedings Environmental Impact Assesment of ACC ECONOMICAL ACTIVITIES. Vol. 2. Praha: Ministerstvo životního prostředí ČR, 1993. pp. 79-82.
  • Rok: 1993

Non -Thermal Plasma Techniques for Pollution Control

A Fast Acting All-Metal Gas Valve for Plasma Research.

  • Pracoviště: Katedra fyziky
  • Anotace:
    A fast acting all-metal gas valve has been developed for injection pulses of neutral gases into a high valcuum. The design of the valve makes it possible to change the length of time the valve is open and thus vary the number of atoms admitted.

Za stránku zodpovídá: Ing. Mgr. Radovan Suk