SIMULATION OF PREBREAKDOWN PROCESSES IN DIELECTRIC LIQUIDS

Results on simulation of streamer dynamics in dielectric liquids are discussed. The model describing the streamer dynamics accounts phase transition - formation of expanding gaseous channels behind streamer heads, due to Joule heating and vaporization of the liquid131-13

DYNAMICS OF SUBNANOSECOND BREAKDOWN OF HIGH-PRESSURE GASES

Recent results on computational study of subnanosecond discharge formation are presented. Their comparison with available experimental data is given. The effects of various factors governing the discharge characteristics are discussed.130-13

INTERACTION OF HELIUM AND ARGON PLASMA JETS ARRAYS

We discuss results from computational investigations of the properties of jets arrays operated in He and Ar. He or Ar is flowing through the tubes of the jets into ambient humid air. We show that jet-jet interactions primarily depend on the properties of plasma forming gas through the tubes. For the helium array, the jets at edges of the array tend to divert while for Ar array plasma propagates more directionally.223-22

Destruction of chemical warfare surrogates using a portable atmospheric pressure plasma jet

Today’s reality is connected with mitigation of threats from the new chemical and biological warfare agents. A novel investigation of cold plasmas in contact with liquids presented in this paper demonstrated that the chemically reactive environment produced by atmospheric pressure plasma jet (APPJ) is potentially capable of rapid destruction of chemical warfare agents in a broad spectrum. The decontamination of three different chemical warfare agent surrogates dissolved in liquid is investigated by using an easily transportable APPJ. The jet is powered by a kHz signal source connected to a low-voltage DC source and with He as working gas. The detailed investigation of electrical properties is performed for various plasmas at different distances from the sample. The measurements of plasma properties in situ are supported by the optical spectrometry measurements, whereas the high performance liquid chromatography measurements before and after the treatment of aqueous solutions of Malathion, Fenitrothion and Dimethyl Methylphosphonate. These solutions are used to evaluate destruction and its efficiency for specific neural agent simulants. The particular removal rates are found to be from 56% up to 96% during 10 min treatment. The data obtained provide basis to evaluate APPJ’s efficiency at different operating conditions. The presented results are promising and could be improved with different operating conditions and optimization of the decontamination process

SIMULATION OF PREBREAKDOWN PROCESSES IN DIELECTRIC LIQUIDS

131-131Results on simulation of streamer dynamics in dielectric liquids are discussed. The model describing the streamer dynamics accounts phase transition - formation of expanding gaseous channels behind streamer heads, due to Joule heating and vaporization of the liqui

DYNAMICS OF SUBNANOSECOND BREAKDOWN OF HIGH-PRESSURE GASES

130-130Recent results on computational study of subnanosecond discharge formation are presented. Their comparison with available experimental data is given. The effects of various factors governing the discharge characteristics are discussed

INTERACTION OF HELIUM AND ARGON PLASMA JETS ARRAYS

223-223We discuss results from computational investigations of the properties of jets arrays operated in He and Ar. He or Ar is flowing through the tubes of the jets into ambient humid air. We show that jet-jet interactions primarily depend on the properties of plasma forming gas through the tubes. For the helium array, the jets at edges of the array tend to divert while for Ar array plasma propagates more directionally

DETERMINATION OF QUENCHING CROSS SECTION OF RESONANT Cs(6P) STATE BY CO2 MOLECULES IN DISCHARGE IN He - CO2 - Cs.

As molecular plasmas with alkali seedings are widely used in different devices the data on elementary processes in such plasmas are of great interest. One of the main processes in this type of plasmas which influences both energy balance and ionization balance of plasma is the collisional deactivation of resonant state of alkali atoms by molecules. In [I] a detailed review is given of experimental and theoretical data on quenching cross sections for different pairs : alkali atom + molecule. However there is no ineformation in literature about such process for pair:cesium + carbon dioxide

Reactive species in non-equilibrium atmospheric-pressure plasmas: Generation, transport, and biological effects

Non-equilibrium atmospheric-pressure plasmas have recently become a topical area of research owing to their diverse applications in health care and medicine, environmental remediation and pollution control, materials processing, electrochemistry, nanotechnology and other fields. This review focuses on the reactive electrons and ionic, atomic, molecular, and radical species that are produced in these plasmas and then transported from the point of generation to the point of interaction with the material, medium, living cells or tissues being processed. The most important mechanisms of generation and transport of the key species in the plasmas of atmospheric-pressure plasma jets and other non-equilibrium atmospheric-pressure plasmas are introduced and examined from the viewpoint of their applications in plasma hygiene and medicine and other relevant fields. Sophisticated high-precision, time-resolved plasma diagnostics approaches and techniques are presented and their applications to monitor the reactive species and plasma dynamics in the plasma jets and other discharges, both in the gas phase and during the plasma interaction with liquid media, are critically reviewed. The large amount of experimental data is supported by the theoretical models of reactive species generation and transport in the plasmas, surrounding gaseous environments, and plasma interaction with liquid media. These models are presented and their limitations are discussed. Special attention is paid to biological effects of the plasma-generated reactive oxygen and nitrogen (and some other) species in basic biological processes such as cell metabolism, proliferation, survival, etc. as well as plasma applications in bacterial inactivation, wound healing, cancer treatment and some others. Challenges and opportunities for theoretical and experimental research are discussed and the authors’ vision for the emerging convergence trends across several disciplines and application domains is presented to stimulate critical discussions and collaborations in the future