Abstract

We examine the velocity distribution function for a gas flowing between parallel plates. It is shown that in a mass-force field acting across the channel the distribution function will be discontinuous in phase space on some hypersurface for any Knudsen numbers. The formula is found for the variation of the discontinuity with increasing distance from one of the boundaries into the volume and an estimate is made of the thickness of the layer within which the discontinuity is significant.

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