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	Comparison of laminar and turbulent thermal plasma jet characteristics - A modeling study
	Cheng, K ; Chen, X ; Pan, WX
	2010-05-07 ; 2010-05-07
关键词	thermal plasma laminar and turbulent jets comparative study modeling CARRIER-GAS ATMOSPHERIC-PRESSURE HIGH-VELOCITY AMBIENT AIR ENTRAINMENT LONG GENERATION DIFFUSION INJECTION PARTICLE Engineering, Chemical Physics, Applied Physics, Fluids & Plasmas
中文摘要	Modeling results are presented to compare the characteristics of laminar and turbulent argon thermal plasma jets issuing into ambient air. The combined-diffusion-coefficient method and the turbulence-enhanced combined-diffusion-coefficient method are employed to treat the diffusion of ambient air into the laminar and turbulent argon plasma jects, respectively. It is shown that since only the molecular diffusion mechanism is involved in the laminar plasma jet, the mass flow rate of ambient air entrained into the laminar plasma jet is comparatively small and less dependent on the jet inlet velocity. On the other hand, since turbulent transport mechanism is dominant in the turbulent plasma jet, the entrainment rate of ambient air into the turbulent plasma jet is about one order of magnitude larger and almost directly proportional to the jet inlet velocity. As a result, the characteristics of laminar plasma jets are quite different from those of turbulent plasma jets. The length of the high-temperature region of the laminar plasma jet is much longer and increases notably with increasing jet inlet velocity or inlet temperature, while the length of the high-temperature region of the turbulent plasma jet is short and less influenced by the jet inlet velocity or inlet temperature. The predicted results are reasonably consistent with available experimental observation by using a DC arc plasma torch at arc currents 80-250 A and argon flow rates (1.8-7.0)x10(-4) kg/s.
语种	英语 ; 英语
出版者	SPRINGER/PLENUM PUBLISHERS ; NEW YORK ; 233 SPRING ST, NEW YORK, NY 10013 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/15702]
专题	清华大学
推荐引用方式 GB/T 7714	Cheng, K,Chen, X,Pan, WX. Comparison of laminar and turbulent thermal plasma jet characteristics - A modeling study[J],2010, 2010.
APA	Cheng, K,Chen, X,&Pan, WX.(2010).Comparison of laminar and turbulent thermal plasma jet characteristics - A modeling study..
MLA	Cheng, K,et al."Comparison of laminar and turbulent thermal plasma jet characteristics - A modeling study".(2010).

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