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Title:
Continuum perspective of bulk viscosity in compressible fluids
Author: Li XD; Hu ZM(胡宗民); Jiang ZL(姜宗林)
Source: JOURNAL OF FLUID MECHANICS
Issued Date: 2017
Volume: 812, Pages:966-990
Abstract: 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.
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Hu, ZM (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
Correspondent Email: huzm@imech.ac.cn
DOI: 10.1017/jfm.2016.834
Related URLs: 查看原文
DOC Type: Article
WOS Subject: Mechanics ; Physics, Fluids & Plasmas
WOS Subject Extended: Mechanics ; Physics
WOS Keyword Plus: compressible flows ; gas dynamics ; Navier-Stokes equations
WOS ID: WOS:000392712400043
ISSN: 0022-1120
Funder: This work is supported by the National Natural Foundation of China under grant nos 11532014 and 11672308.
Rank: [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
Department: LHD激波与爆轰物理
Classification: 一类
Ranking: 1
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60103
Appears in Collections:高温气体动力学国家重点实验室_期刊论文

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Recommended Citation:
Li XD,Hu ZM,Jiang ZL. Continuum perspective of bulk viscosity in compressible fluids[J]. JOURNAL OF FLUID MECHANICS,2017-01-01,812:966-990.
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