On the velocity relaxation of a Rayleigh gas

Leonardo Ferrari

Physica A: Statistical Mechanics and its Applications, 1985, vol. 133, issue 1, 103-119

Abstract: The relaxation of the most important velocity averages of the heavy component of a Rayleigh gas is considered. The relaxation process is studied first exactly in the Maxwell model, and, subsequently, by using the approximate equations following from the usual kinetic equation, in the Rayleigh limit. In some cases non-negligible discrepancies appear between the exact and the approximate results found for a Rayleigh gas in which a heavy-particle-light-particle Maxwellian interaction takes place. In particular it is shown that in certain situations the heavy-particle mean-square velocity components relax, in the approximate theory, in an unphysical way, unless an appropriate limitation on the initial heavy-particle mean velocity is imposed.

Date: 1985
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:133:y:1985:i:1:p:103-119

DOI: 10.1016/0378-4371(85)90058-5

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