Continuum perspective of bulk viscosity in compressible fluids

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	Continuum perspective of bulk viscosity in compressible fluids
	Li XD; Hu ZM(胡宗民); Jiang ZL(姜宗林)
刊名	JOURNAL OF FLUID MECHANICS
	2017
通讯作者邮箱	huzm@imech.ac.cn
卷号	812 页码:966-990
ISSN号	0022-1120
通讯作者	Hu, ZM (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
产权排序	[Li, Xin-Dong; Hu, Zong-Min; Jiang, Zong-Lin] Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
中文摘要	Kinetic theory and acoustic measurements have proven that the hulk viscosity associated with the expansion or compression effect cannot be ignored in compressible fluids except for monatomic gases. A new theoretical formula for the bulk viscosity coefficient (BVC) is derived by the continuum medium methodology, which provides a further understanding of the bulk viscosity, i.e. zeta is equal to the product of the hulk modulus K and the relaxation time tau (zeta = K tau). The continuum and kinetic theories present consistent results from macro- and microperspectives respectively, only differing in terms of a coefficient. The theoretical predictions of the BVC in diatomic molecules, such as N-2, O-2 and CO, show good agreement with the experimental data over a wide range of temperature. In addition, the vibrational contributions to are controlled by a rapid exponential decrease at high temperatures, while at low temperatures a slow linear increase proceeds for the rotational cases. The relaxation time tau, collision number Z, BVC zeta and ratio of bulk-to-shear viscosities zeta/mu in the vibrational mode are found to be several orders of magnitude larger than those in the rotational mode.
分类号	一类
类目[WOS]	Mechanics ; Physics, Fluids & Plasmas
研究领域[WOS]	Mechanics ; Physics
关键词[WOS]	compressible flows ; gas dynamics ; Navier-Stokes equations
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1017/jfm.2016.834
语种	英语
WOS记录号	WOS:000392712400043
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/60103]
专题	力学研究所_高温气体动力学国家重点实验室
推荐引用方式 GB/T 7714	Li XD,Hu ZM,Jiang ZL. Continuum perspective of bulk viscosity in compressible fluids[J]. JOURNAL OF FLUID MECHANICS,2017,812:966-990.
APA	Li XD,胡宗民,&姜宗林.(2017).Continuum perspective of bulk viscosity in compressible fluids.JOURNAL OF FLUID MECHANICS,812,966-990.
MLA	Li XD,et al."Continuum perspective of bulk viscosity in compressible fluids".JOURNAL OF FLUID MECHANICS 812(2017):966-990.