Abstract
In this paper, the momentum and heat transfer between charged particles and neutral particles in a needle-to-plane dielectric barrier discharge reactor with Ar as the working gas are simulated. In this simulation, the heat transfer from ions to the neutral atom is described by the interaction term between ions and atoms. Detailed discharge reaction mechanisms are considered in the simulation including metastable atom. The Navier-Stokes equation is solved in combination with the Poisson equation and the charged particles drift-diffusion equations. The interrelation between the gas discharge and the gas flow characteristics are preliminary revealed. In particular, when the streamer strikes the cathode, the maximum gas temperature can reach 1026 K, and the high temperature area is concentrated in a confined space around the needle cathode tip with a thickness of 0.01 mm and a diameter of 0.1 mm. Then, the temperature change decreases to 400 K in 1 μs. Induced by the discharge, the pressure perturbation of the gas can exceed 6×104 Pa at 1.1 μs, and an expanding wave is created. The propagation velocity of the expanding wave is close to the sound velocity. The forward velocity decreases from approximately 120 m/s at 1.1 μs to 5.5 m/s at 4.4 μs. The inverted velocity remains at approximately 5 m/s. The number density for the neutral particles has a minimum value, which is approximately 8×1024 m-3, in the sheath as well as changes in the expanding wave propagation in the plasma bulk.
Highlights
There has been increasing interest in the development of dielectric barrier discharge (DBD) at atmospheric pressure.1–3 DBD is used in several applications, such as pollutants removal,4,5 biomedical applications,6 surface treatment,7,8 and flow control.9Generally, the heat transfer in plasma is not considered in lowpressure plasma and equilibrium plasma
The heat transfer between different particles may be neglected in the simulation of low-pressure nonequilibrium plasma and thermal equilibrium plasma
This heat transfer should be considered in the simulation of atmospheric pressure plasma, which is the transition state between the nonequilibrium state and equilibrium state
Summary
There has been increasing interest in the development of dielectric barrier discharge (DBD) at atmospheric pressure. DBD is used in several applications, such as pollutants removal, biomedical applications, surface treatment, and flow control.. Papadakis and Georghiou et al. developed a more complete discharge model with considering the momentum and heat transfer between the charged particles and neutral gas particles. A simulation based on the Papadakis model and FE-FCT algorithm is carried out to study the heat and momentum transfer process in a needle-to-plane DBD reactor with Ar as the working gas. In this model, the electron and ion production and loss processes, the momentum transfer and the heat transfer in plasma are described for collision between particles. The interrelation between the gas discharge and gas flow characteristics is preliminary revealed
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