Flow and Self-Diffusion of Gases in Capillaries. Part II

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Abstract
A variety of experimental data on the pressure dependence of the flow of gases through capillaries are examined using the model presented in Part I. The model is found to provide a good description of flow and self-diffusion in capillaries of arbitrary length-to-radius ratio at pressures ranging from the near free molecule to the continuum regimes. Experimental free-molecule flows are found to differ from those predicted from existing theories based on the diffuse scattering of gas molecules by the capillary wall. The differences, which in general cannot be explained by specular reflection, are found to depend on the geometrical structure of the surface, the length-to-radius ratio of the capillary, and on the gas being transported. For a given gas flowing through a capillary of given length-to-radius ratio, the slip contribution to the transport is found to be a monotonically increasing function of the ratio of observed-to-theoretical free-molecule transports.

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