Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Physics of Fluids
8 (1996), S. 258-261
ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The interpretation of bulk viscosity as a relaxation parameter for describing nonequilibrium polyatomic gases is challenged both qualitatively and quantitatively. Its presumed proportionality to a relaxation time is an artificial concept restricted to very rapid equilibration of translational and internal modes compared with some characteristic time of the system. Application of a generalized methodology to small-signal sound waves of intermediate and high frequencies demonstrates this artificiality and shows that bulk viscosity can at best be used as a nonphysical adjustable parameter to force fit a single aspect of relaxation. Sound absorption can be force fitted in this way, but not the dispersion of the sound speed. Accordingly, recent applications of bulk viscosity in solving such problems as heat transfer in hypersonic boundary layers may be seriously deficient. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.868833
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