Abstract

The effect of a stationary solid body on the flow of rarefied gases is considered. We also consider the effect of an oscillating solid body on a rarefied gas. For a gas of particles of arbitrary statistics we derive coupled integral equations for the chemical potential, velocity field, and temperature. We show that the stationary value of a functional is closely related to the drag exerted on the body. When the mean free path is much larger than a typical dimension of the body, we show that the drag is given by a simple surface integral.

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