Method for simulating dynamic evolution of bubble discharge plasma in ethanol

Abstract

The invention discloses a method for simulating dynamic evolution of bubble discharge plasma in ethanol. The method comprises the following steps of: firstly, establishing a geometric model of bubble discharge in ethanol, a plasma chemical model for describing an electron collision reaction process and an electrohydrodynamic model for describing a discharge physical process; and then setting model boundary conditions, performing mesh generation on a computational domain, solving a model control equation by using simulation software through a finite element method, and performing post-processing to obtain spatial-temporal evolution dynamic images of electric field intensity, particle concentration distribution and a plasma channel. The method can be used to simulate the starting and developing dynamic process of discharge of bubbles containing different gas components in ethanol under different voltage values and the formation process of active particles under the conditions of room temperature and standard atmospheric pressure, provides data support for researching the influence of voltage amplitude on discharge plasma characteristics, and is simple, convenient and efficient to operate.

Description

technical field [0001] The invention relates to the technical field of plasma discharge physics, in particular to a method for simulating the dynamic evolution of bubble discharge plasma in ethanol. Background technique [0002] In the field of low-temperature plasma physics, bubble discharge in ethanol has been widely used in the preparation of nanomaterials and hydrogen production technology because it can produce a variety of active particles. The difficulty of liquid phase discharge can be effectively reduced by introducing bubble discharge into liquid ethanol. In addition, the use of bubbles containing different gas components can control the active substances generated in the plasma and eventually diffuse into the surrounding liquid ethanol, thereby achieving different discharge treatment effects. Understanding the basic physical and chemical processes of bubble discharge is crucial to promote the development of non-equilibrium plasma. Therefore, a large number of expe...

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Problems solved by technology

[0003] However, due to the complexity of the discharge system, it is difficult to fully understand the dynamic characteristics of the internal discharge of the bubble through the current experimental diagnosis, so it is necessary to use numerical simulation methods to conduct research to further explain the experimental observations, such as Levko D et al. (Non-thermal plasma Ethanol reforming in bubbles immersed in liquids, Journal of Physics D: Applied Physics 2017, Vol. 50) provides valuable insights into the behavior of isolated bubble discharges in alcohol solutions using an adaptive simulation approach, but for electrode tips at room temperature and pressure The kinetics of discharge initiation, propagation in the bubble, and subsequent formation of reacted species in attached bubbles remains difficult.

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