Bulletin of the American Physical Society
72nd Annual Gaseous Electronics Conference
Volume 64, Number 10
Monday–Friday, October 28–November 1 2019; College Station, Texas
Session DT3: Modeling and Simulation I |
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Chair: Xiaopu Li Room: Century III |
Tuesday, October 29, 2019 10:00AM - 10:15AM |
DT3.00001: Numerical Study of Discharge Characteristics of Atmospheric Pressure Dielectric Barrier Discharge in Ar/N2 Gas Mixture Abhishek Kumar Verma, Venkattraman Ayyaswamy Atmospheric pressure dielectric barrier discharge (DBD) has attracted a significant research interest due to unique discharge characteristics applicable to plasma medicine, material synthesis and plasma enhanced chemical conversion. In this work, we performed 1D/2D fluid model simulation of DBD in Argon gas with Nitrogen as impurity, to study discharge characteristics, such as current-voltage, power dynamics, plasma species enhancement etc. A comparative study on plasma parameters is performed by applying RF power source to excite capacitively coupled plasma. Further, modification of such power source to dual frequency and applied DC bias is studied. The insights from 1D simulations results have been used to design numerical experiments for large simulations. Most of the previous study on this topic focuses on 1D simulations. To study the effect of dimensionality in complex electrode-dielectric geometry, we performed 2D simulations of a roll-to-roll plasma reactor with curved electrode. Also, some simulation perspectives from plasma needle-dielectric configuration is included. This work expands on the idea of providing critical insights for the development of reduced order models to facilitate the design and development of DBD reactor for a wide range of applications. [Preview Abstract] |
Tuesday, October 29, 2019 10:15AM - 10:30AM |
DT3.00002: Numerical Modeling of the Plasma-Liquid Interface using the Zapdos-CRANE Open-Source Package Shane Keniley, Davide Curreli, Corey DeChant, Steven Shannon Plasma-liquid systems are experiencing growing interest due to their applications in medicine and chemical production. Even so, the chemical pathways in the interface region and the transport of electrons into the liquid phase remain poorly understood. In this work the plasma-liquid interface of a needle-on-water system is modeled with the MOOSE-based open source finite element model, Zapdos-CRANE. Zapdos is a plasma transport model previously used to study plasma-liquid interactions, while CRANE (\underline {https://github.com/lcpp-org/crane}) is a plasma chemistry software written to solve reaction networks of arbitrary size. The coupled drift-diffusion-reaction model is utilized to study the chemical pathways of reactive oxygen species (ROS) in a fully-coupled 2D argon plasma-liquid water system. The impact of the electron surface loss coefficient on the formation of ROS at the liquid interface is investigated. [Preview Abstract] |
Tuesday, October 29, 2019 10:30AM - 10:45AM |
DT3.00003: Abstract moved to poster session MW1.0091 |
Tuesday, October 29, 2019 10:45AM - 11:00AM |
DT3.00004: Modeling of RF breakdown in different atmospheres Zoran Petrovic, Marija Puač, Antonije Đorđević Physical background of radio-frequency (RF) breakdown can be analyzed by observing evolution of electron swarm between two electrodes. That leads to Monte Carlo method as a superior technique for RF breakdown investigation. After analysis of voltage breakdown curve in argon [1], we are now focusing on RF breakdown in different planetary atmospheres. Starting point is gas mixture that represents air, consisting of 80{\%} N$_{\mathrm{2}}$ and 20{\%} O$_{\mathrm{2}}$. Peculiar feature of this mixture is appearance of the second minimum at lower pressures in voltage breakdown curve. This minimum is direct consequence of the secondary electron emission at electrodes by ion bombardment. By observing spatial plots of electrons concentration, mean energy and rate of ionization, we have analyzed how changes in pressure/voltage at fixed value of voltage/pressure determine the shape of the voltage breakdown curve. On the other hand, investigation of RF breakdown in atmosphere of Mars can address whether devices for power electronics and telecommunications may have problems due to an induced breakdown. As the pressure at Mars surface is low, it is close to the minimum of the breakdown curve and RF breakdown may be induced by relatively low voltages. [1] Pua\v{c} et al, Plasma Sources Sci. and Technol. 27 (2018) 075013. [Preview Abstract] |
Tuesday, October 29, 2019 11:00AM - 11:30AM |
DT3.00005: Kinetic photon transport in low-temperature plasma simulations Invited Speaker: Andrew Fierro Light emission from plasmas is one of the defining characteristics from plasma discharges. This light is often used to elucidate fundamental plasma properties such as gas constituents and plasma temperature. Furthermore, self-produced light emission from the plasma source is often energetic enough to influence the plasma discharge itself through interaction with background gas atoms and molecules or with the surfaces that contain the plasma. As an example, it’s well-known that photoionization plays an important role in the propagation of positive streamers. To address this and other photon-driven phenomena, a method has been developed to incorporate photons in a particle-in-cell, direct simulation Monte Carlo code that accounts for several line broadening mechanisms. This method allows for the incorporation of energy-dependent photo-processes, such as photo-ionization and photo-emission, into particle-based plasma simulations. This talk will discuss the numerical method for this discrete tracking of photons and several examples of the influence of photons on transient discharge formation. [Preview Abstract] |
Tuesday, October 29, 2019 11:30AM - 12:00PM |
DT3.00006: On the influence of collisions in the properties of low-temperature plasmas Invited Speaker: LL Alves Research studies on ``plasma chemistry'' are key when developing plasma-driven applications, as they provide insight on the plasma-enhanced production of reactive species, namely by describing the transfer of energy between species and identifying the most relevant chemical-reaction pathways. The topic is not without challenges, because it requires describing the behavior of various types of particles (charged and neutral, in several excited states), intrinsically in non-equilibrium with each other, undergoing a large number of collisional, radiative and electrostatic interactions. With regard to numerical modeling, the detailed description of the plasma chemistry in complex gas mixtures should involve the coupled solution of a Chemistry module, solving the rate balance equations for the most relevant plasma species (according to a kinetic scheme defining their production / destruction mechanisms), and a Boltzmann module, describing the electron kinetics by solving the corresponding Boltzmann equation. Monitoring the behavior of the electrons is usually at the core of the modelling work-program, particularly at low pressures, since they are the prime responsible for a collisional energy-transfer from the excitation source to the gas/plasma system. In this context, we have recently developed The LisbOn KInetics (LoKI) simulation tool [1,2] using flexible and upgradable object-oriented programming under MATLAB\textregistered . The Boltzmann component of this platform (LoKI-B), available as open-source code [3], solves the space-independent form of the two-term electron Boltzmann equation for any atomic / molecular gas mixture, handling first and second-kind electron collisions with any target state (electronic, vibrational and rotational), characterized by any user-prescribed population. This work focuses mostly on electron collisions, leveraging on the LoKI-B simulation tool. We will revisit some aspects of the operators used in the two-term electron Boltzmann equation (e.g. continuous operators for rotational mechanisms [4] and for stochastic heating adopting a Fokker-Planck approach [5]), and analyze the influence of these collisions in the plasma energy transfer (namely in fast-pulsed plasmas). \newline [1] A. Tejero-del-Caz \textit{et al}, Plasmas Sources Sci. Technol. \textbf{28} (2019) 043001 \newline [2] P. Coche \textit{et al}, J. Phys. D \textbf{49} (2016) 235207 \newline [3] \underline {https://github.com/IST-Lisbon/LoKI} \newline [4] M. A. Ridenti \textit{et al}, Plasma Sources Sci. Technol. \textbf{24} (2015) 035002 \newline [5] U. Czarnetzki, Plasma Sources Sci. Technol., submitted (2019) [Preview Abstract] |
Tuesday, October 29, 2019 12:00PM - 12:15PM |
DT3.00007: Modelling the effects of plasma on intracellular metabolism Tomoyuki Murakami Recently, cold atmospheric plasmas (CAPs) have been widely applied in the field of biomedicine. However, a mechanistic understanding of how CAPs exert their biological effects is still elusive. To understand the precise cell functions underlying such effects, systematic biological-reaction models suitable for CAP studies are necessary. Here, a biochemical reaction model is developed to clarify how CAPs affect intracellular metabolism. Fundamental functions of mitochondria-dependent pathways in reactive oxygen species/reactive nitrogen species (ROS/RNS)-mediated mechanisms are numerically simulated. The present computational model demonstrates that CAPs crucially influence essential cellular functions, ex the bistability in apoptosis, which in turn affect cell fate decision of survival or death. The key issues to link the CAP-physics and chemistry with biological systems will be presented and discussed in the talk. [Preview Abstract] |
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