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Continuum perspective of bulk viscosity in compressible fluids
Li XD; Hu ZM(胡宗民); Jiang ZL(姜宗林); Hu, ZM (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
Source PublicationJOURNAL OF FLUID MECHANICS
2017
Volume812Pages:966-990
ISSN0022-1120
AbstractKinetic 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.
DOI10.1017/jfm.2016.834
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000392712400043
WOS Keywordcompressible flows ; gas dynamics ; Navier-Stokes equations
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding OrganizationThis work is supported by the National Natural Foundation of China under grant nos 11532014 and 11672308.
DepartmentLHD激波与爆轰物理
Classification一类
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60103
Collection高温气体动力学国家重点实验室
Corresponding AuthorHu, ZM (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Li XD,Hu ZM,Jiang ZL,et al. 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,&Hu, ZM .(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.
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