ON GASEOUS SELF-DIFFUSION IN CAPILLARIES
The self-diffusion of a gas in a capillary has been reexamined using a density distribution which gives the same transport at the end and mid-point of the tube. This density function is chosen to be linear through the tube with effective discontinuities at the ends. Previous calculations in the limit of infinite mean free path have shown such a distribution to be reasonably reliable. The calculation reported here determines the limiting slope of the diffusion transport with increasing a/ Svlvania Electr for right circular cylindrical capillaries of arbitrary length to radius ratio. The results are similar to those obtained previously by Pollard and Present, and Hiby and Pahl, but are believed to be more reliable. Theoretical predictions are compared with experimental data of Visner and seem to account satisfactorily for the observed decrease of the self-diffusion coefficient with increasing pressure. It is apparent that results from considerations of selfdiffusion cannot be applied directly to flow at finite pressure. (auth)
- Research Organization:
- Oak Ridge Gaseous Diffusion Plant, Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-13-011957
- OSTI ID:
- 4274093
- Report Number(s):
- K-1401
- Country of Publication:
- United States
- Language:
- English
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