Modeling on the Momentum and Heat/Mass Transfer Characteristics of an Argon Plasma Jet Issuing into Air Surroundings and Interacting with a Counter-Injected Argon Jet |
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Authors: | Hai-Xing Wang Xi Chen He-Ping Li |
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Institution: | (1) School of Astronautics, Beijing University of Aeronautics and Astronautics, 100191 Beijing, China;(2) Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, China;(3) Department of Engineering Physics, Tsinghua University, 100084 Beijing, China |
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Abstract: | Modeling study is performed to reveal the momentum and heat/mass transfer characteristics of a turbulent or laminar plasma
reactor consisting of an argon plasma jet issuing into ambient air and interacting with a co-axially counter-injected argon
jet. The combined-diffusion-coefficient method and the turbulence-enhanced combined-diffusion-coefficient method are employed
to treat the diffusion of argon in the argon–air mixture for the laminar and the turbulent regimes, respectively. Modeling
results presented include the streamline, isotherm and argon mass fraction distributions for the cases with different jet-inlet
parameters and different distances between the counter-injected jet exit and the plasma torch exit. It is shown that there
exists a quench layer with steep temperature gradients inside the reactor; a great amount of ambient air is always entrained
into the plasma reactor; and the flow direction of the entrained air, the location and shape of the quench layer are dependent
on the momentum flux ratio of the plasma jet to the counter-injected cold gas. Two quite different flow patterns are obtained
at higher and lower momentum flux ratios, and thus there exists a critical momentum flux ratio to separate the different flow
patterns and to obtain the widest quench layer. There exists a high argon concentration or even ‘air-free’ channel along the
reactor axis. No appreciable difference is found between the turbulent and laminar plasma reactors in their overall plasma
parameter distributions and the quench layer locations, but the values of the critical momentum flux ratio are somewhat different. |
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Keywords: | |
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