Experimental and theoretical study of a glow discharge at atmospheric pressure controlled by dielectric barrier
04 Jun 1998-Journal of Applied Physics (American Institute of Physics)-Vol. 83, Iss: 6, pp 2950-2957
TL;DR: In this paper, the authors confirm the existence of atmospheric pressure dielectric controlled glow discharge and describe its main behavior using electrical measurements, short time exposure photographs, and numerical modeling.
Abstract: The aim of this paper is to confirm the existence of atmospheric pressure dielectric controlled glow discharge and to describe its main behavior. Electrical measurements, short time exposure photographs, and numerical modeling were used to achieve this task. Experimental observations and numerical simulation are in good agreement. Therefore, the analysis of the calculated space and time variations of the electric field together with the ion and electron densities helps to explain the discharge mechanisms involved, showing the main role played by the electron as well as helium metastable density just before the discharge is turned on.
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TL;DR: In this article, the authors discuss the history, discharge physics, and plasma chemistry of dielectric-barrier discharges and their applications and discuss the applications of these discharges.
Abstract: Dielectric-barrier discharges (silent discharges) are used on a large industrial scale. They combine the advantages of non-equilibrium plasma properties with the ease of atmospheric-pressure operation. A prominent feature is the simple scalability from small laboratory reactors to large industrial installations with megawatt input powers. Efficient and cost-effective all-solid-state power supplies are available. The preferred frequency range lies between 1 kHz and 10 MHz, the preferred pressure range between 10 kPa and 500 kPa. Industrial applications include ozone generation, pollution control, surface treatment, high power CO2 lasers, ultraviolet excimer lamps, excimer based mercury-free fluorescent lamps, and flat large-area plasma displays. Depending on the application and the operating conditions the discharge can have pronounced filamentary structure or fairly diffuse appearance. History, discharge physics, and plasma chemistry of dielectric-barrier discharges and their applications are discussed in detail.
2,730 citations
TL;DR: Non-equilibrium plasmas will be shown to be non-destructive to tissue, safe, and effective in inactivation of various parasites and foreign organisms.
Abstract: An emerging field of plasma medicine is discussed, where non-equilibrium plasmas are shown to be able to initiate, promote, control, and catalyze various complex behaviors and responses in biological systems. More importantly, it will be shown that plasma can be tuned to achieve the desired medical effect, especially in medical sterilization and treatment of different kind of skin diseases. Wound healing and tissue regeneration can be achieved following various types of plasma treatment in a multitude of wound pathologies. Non-equilibrium plasmas will be shown to be non-destructive to tissue, safe, and effective in inactivation of various parasites and foreign organisms.
1,819 citations
TL;DR: A review of the literature on active flow control with non-thermal actuators can be found in this paper, where the main advantages of such systems are their robustness, simplicity, low power consumption and ability for real-time control at high frequency.
Abstract: Active flow control is a topic in full expansion due to associated industrial applications of huge importance, particularly for aeronautics. Among all flow control methods, such as the use of mechanical flaps, wall synthetic jets or MEMS, plasma-based devices are very promising. The main advantages of such systems are their robustness, simplicity, low power consumption and ability for real-time control at high frequency. This paper is a review of the worldwide works on this topic, from its origin to the present. It is divided into two main parts. The first one is dedicated to the recent knowledge concerning the electric wind induced by surface non-thermal plasma actuators, acting in air at atmospheric pressure. Typically, it can reach 8 m s−1 at a distance of 0.5 mm from the wall. In the second part, works concerning active airflow control by these plasma actuators are presented. Very efficient results have been obtained for low-velocity subsonic airflows (typically U∞ ≤ 30 m s−1 and Reynolds number of a few 105), and promising results at higher velocities indicate that plasma actuators could be used in aeronautics.
1,519 citations
TL;DR: A particular type of plasma actuator that has gained wide use is based on a single-dielectric barrier discharge (SDBD) mechanism that has desirable features for use in air at atmospheric pressures as mentioned in this paper.
Abstract: The term plasma actuator has now been a part of the fluid dynamics flow-control vernacular for more than a decade. A particular type of plasma actuator that has gained wide use is based on a single–dielectric barrier discharge (SDBD) mechanism that has desirable features for use in air at atmospheric pressures. For these actuators, the mechanism of flow control is through a generated body-force vector field that couples with the momentum in the external flow. The body force can be derived from first principles, and the effect of plasma actuators can be easily incorporated into flow solvers so that their placement and operation can be optimized. They have been used in a wide range of internal and external flow applications. Although initially considered useful only at low speeds, plasma actuators are effective in a number of applications at high subsonic, transonic, and supersonic Mach numbers, owing largely to more optimized actuator designs that were developed through better understanding and modeling of...
1,086 citations
TL;DR: An overview of gas discharge plasmas can be found in this paper, where the most important applications of these and related plasmmas are discussed, as well as their working principles.
928 citations
References
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TL;DR: In this paper, the Lissajous figure of voltage-electric charges and current pulse shapes are used as a method of distinguishing between the atmospheric pressure glow plasma and the silent electric discharge.
Abstract: Unusual glow discharges in air, argon, oxygen and nitrogen at atmospheric pressure can be produced using a 50 Hz source. This technique is introduced on the basis of the idea of a lower dielectric breakdown voltage gas. The electrode system, which is composed of a fine metal wire mesh of specified radius and a dielectric substance, is very useful for plasma surface processes and for chemical reactions in the plasma bulk. The observations of the Lissajous figure of voltage-electric charges and of the current pulse shapes are proposed as a method of distinguishing between the atmospheric pressure glow plasma and the silent electric discharge.
451 citations
TL;DR: In this article, the authors presented an analysis of the field variation of Townsend's first ionization coefficient and ion mobilities, and the length of the dark space has been obtained from the calculated distribution of light output across the gap and agrees with the cathode-fall distance calculated from the field distribution.
Abstract: Calculations of the variation of cathode‐fall voltage, the cathode‐fall distance, and the Aston dark space with current density have been made for the rare gases and a few molecular gases on an electronic computer. The calculations were based upon Townsend's ionization equations, but included the field distortion due to space charge. New analyses of the field variation of Townsend's first ionization coefficient and ion mobilities are presented. The length of the dark space has been obtained from the calculated distribution of light output across the gap and agrees with the cathode‐fall distance calculated from the field distribution. Comparisons of the calculated cathode‐fall characteristics with published experimental results indicate the probable validity of the model used for the calculations.
302 citations
TL;DR: In this paper, the authors discussed the stabilisation of a glow discharge at atmospheric pressure which was attained by controlling the following three conditions: the use of a high-frequency source, the usage of He gas for dilution and the insertion of a dielectric plate between electrodes.
Abstract: Some reasons are discussed for the stabilisation of a glow discharge at atmospheric pressure which was attained by controlling the following three conditions: the use of a high-frequency source, the use of He gas for dilution and the insertion of a dielectric plate between electrodes. The three conditions interact: the dielectric plate in a plasma forms the pulsed discharge from a low-frequency source, the fast duration of pulse current prevents a transition to an arc style discharge and a large volume of metastable atomic helium aids ionisation or dissociation near the electrode plate and in the flowing gas. The measurements of discharge-maintaining voltage at several hundred volts provide evidence that this is really a glow plasma at atmospheric pressure. The changes of the emission intensities of metastable helium prove indirectly that some dissociation occurs as a result of the action of the helium atom.
287 citations
01 Aug 1990
234 citations
TL;DR: In this paper, a model on the preionization requirements for initiating a volume-stabilized glow discharge is proposed and a minimum required preionized electron density of ∼ 104 cm−3 is predicted for a typical CO2 TEA laser discharge and is consistent with experimental observations.
Abstract: A model on the preionization requirements for initiating a volume‐stabilized glow discharge is proposed. The basic requirement of the model is that the preionized electron density be large enough to cause appreciable spatial overlap of the primary avalanches and consequent smoothing of space‐charge field gradients at the stage when streamer formation would otherwise occur. A minimum required preionization electron density of ∼ 104 cm−3 is predicted for a typical CO2 TEA laser discharge and is consistent with experimental observations.
214 citations