Bulletin of the American Physical Society
75th Annual Gaseous Electronics Conference
Volume 67, Number 9
Monday–Friday, October 3–7, 2022;
Sendai International Center, Sendai, Japan
The session times in this program are intended for Japan Standard Time zone in Tokyo, Japan (GMT+9)
Session IF4: Dielectric Barrier and Corona Discharges |
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Chair: Keisuke Takashima, Tohoku University Room: Sendai International Center Sakura 2 |
Friday, October 7, 2022 4:00PM - 4:15PM |
IF4.00001: Consequences of Photoelectron and Electric Field Emission on Propagation of Surface Ionization Waves Kseniia Konina, Mackenzie Meyer, Mark J Kushner The propagation of atmospheric pressure surface ionization waves (SIWs) across dielectrics produce large fluxes of VUV radiation onto the surface. With non-planar topography, particularly with different materials, electric field enhancements adds to the already large electric field in the head of the SIW. Both VUV radiation and electric field enhancement can result in electron emission occurring ahead of the ionization front. With the range of VUV radiation being longer than the width of the SIW, surfaces can be preprocessed by photoelectron emission preceding the arrival of the SIW. A similar situation occurs with electric field emission. As the SIW approaches, for example, a triple point, the electric field at the triple point intensifies, which can lead to electric field emission prior to the arrival of the SIW. |
Friday, October 7, 2022 4:15PM - 4:30PM |
IF4.00002: Interactions between adjacent surface streamers in a packed bed dielectric barrier discharges (PBDBDs) Zaka-ul-Islam Mujahid, Ihor Korolov, Yue Liu, Thomas Mussenbrock, Julian Schulze Packed bed dielectric barrier discharges (PBDBDs) are promising for plasma catalysis applications. In a typical PBDBD, a volume DBD is filled with dielectric (catalyst support) pellets. The surface streamer’s or surface ionization wave’s propagation over the dielectric pellet surface is considered to be very important for plasma catalyst synergy. In this work, we have used a PBDBD with regularly arranged dielectric pellets with precise gaps in between to investigate the interaction between adjacent surface streamers, from both experiment and modeling using nonPDPSIM [1]. Experimental results indicate that a larger gap between adjacent pellets increases the plasma emission near the contact points. The modeling shows that the observed effect of the gap between the dielectric pellets is based on repulsion between adjacent streamers and attraction towards the adjacent dielectric pellet. For smaller gaps, the surface streamers move from the pellet surface to the volume and back towards the surface. For larger gaps, the surface streamers propagate along the dielectric surface, but their speed is influenced by the offset from the adjacent streamer. If there is no adjacent streamer, the streamer propagation speed will increase considerably near the contact point, which elucidates the role of repulsion in surface streamer propagation. |
Friday, October 7, 2022 4:30PM - 4:45PM |
IF4.00003: Numerical simulation of discharge process in surface dielectric-barrier-discharge on split covered electrode Hideto Tamura, Shintaro Sato, Naofumi Ohnishi Surface dielectric-barrier-discharge (DBD) is widely utilized for industrial applications as the source of low-temperature plasma. In recent years, the DBD plasma actuator has attracted attention as an active flow control device, which has been studied in the field of aerospace engineering. The electrode arrangements of the DBD plasma actuators diversify to improve their performance. The surface DBD is the key factor that affects the flow control performance of the DBD plasma actuator. In this study, we perform three-dimensional numerical simulations of the surface DBD on split covered electrodes for investigating the influence of the split of the covered electrode on discharge structures. The three-dimensional plasma fluid model is used for the discharge simulations, and the filamentation of the discharge is reproduced. A comparison of the discharge structures among various split conditions is conducted. The electric field on the dielectric surface is distorted by the split of the covered electrodes and discharge structures are changed, which may influence the performance of the DBD plasma actuator. |
Friday, October 7, 2022 4:45PM - 5:00PM |
IF4.00004: Plasma Characteristics of Atmospheric DBD Argon Discharges Simulated by Fluid Model Zehui Zhang, Yue Liu, Wei Wang, Yinan Wang, Yuanzhen Wang, Nannan Li, Dezheng Yang A one-dimensional fluid model is established to investigate the plasma characteristics of atmospheric dielectric barrier argon discharges. In this model, four different dielectric structures, (a)no dielectric covered on the electrodes, (b)the dielectric covered on the powered electrode only, (c)the dielectric covered on the grounded electrode only, and (d)the dielectrics covered on both the powered electrode and the grounded electrode, are considered. It is found that the structure of the dielectric has a significant influence on the discharges. And the plasmas produced in the case (d) are more homogeneous in space, which is more amenable for the application of non-thermal equilibrium plasmas. Further, the effect of neutral gas temperature on the plasmas in case (d) is studied. Numerical results of the plasma densities, the electric field intensity, the electric potential, the ionization rate and the electron temperature with the different neutral gas temperatures are obtained. The results show that as the temperature of the neutral gas increases, the density of the electrons and the ions produced by the discharge decreases. This shift is achieved mainly by affecting the neutral gas density and the ionization rate, the former dominates. Also, the role of the sheath in the discharge gap is furthermore clearly discussed. *This work is supported by the Liaoning Provincial Education Department Scientific Research Project No. L2019049. |
Friday, October 7, 2022 5:00PM - 5:15PM |
IF4.00005: Influence of dielectric shape on the propagation speed and selectivity of cathode or anode directed surface ionization waves in dielectric barriers discharges Constantin Neuroth, Zaka-ul-Islam Mujahid, Ihor Korolov, Quan-Zhi Zhang, Thomas Mussenbrock, Julian Schulze For plasma catalysis applications, the propagation of surface ionization waves (SIW) over dielectric (catalyst support) pellets in dielectric barrier discharges (DBD) is very important for plasma and catalyst interactions. Most past works have investigated the SIW propagation over spherical-like shaped dielectric pellets. The shape of the dielectric pellets is known to influence the performance of the packed bed DBDs [1]. In this work, we have compared the streamer propagation speed for semisphere, cone, and inverted semisphere shaped pellets through both experiments and computations in helium and oxygen mixtures for different voltage amplitudes and polarities. The computations have been performed using plasma hydrodynamics model nonPDPSIM [2]. The results show that the contrasting shapes have a strong influence on the surface streamer’s speed as well as electron impact excitation dynamics. A stronger cathode directed (CD) SIW and a much weaker anode directed (AD) SIW are generated at low voltage independent of the polarity for all shapes. At high voltage, the SIW propagating over the dielectric pellet is always stronger and the polarity can be used for selectivity control towards a dominant CD SIW or AD SIW. The selectivity aspect is also linked with the pellet shape. |
Friday, October 7, 2022 5:15PM - 5:30PM |
IF4.00006: Multi-inception patterns of emitter array/collector systems in DC corona discharge Corentin Marion, Franck Plouraboue, David Fabre, Julien Lemetayer Multiple emitters systems have been previously used so as to increase charge density in the drift region, many times without producing sensible increment neither in total current nor ionic wind. |
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