CONCENTRATION AND VELOCITY PROFILES IN A STEFAN DIFFUSION TUBE
The Stefan diffusion tube was widely used as a means of determining vapor-phase diffusion coefficients. By this method the diffusion coefficient was calculated on the asaumption of plug-flow (flat) concentration and velocity profiles in the diffusion tube. These assumptions were examined theoretically and experimentaily in this study. The theoretical study and the experimental results indicated that the concentration profile is flat across the diffusion tubs. The veloctty profile was found to be developing from a ilat one near the liquid surface to a parabolic one at the other end of the tube. However, it was shown theoreticaily that the shape of the velocity profile does not affect the mass flux provided the concentration profile is flat. Thus diffusion data that were calculated from Stefan diffusion tube data with the plug flow approximation are correct. (auth)
- Research Organization:
- California Univ., Berkeley, CA (US). Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-17-008538
- OSTI ID:
- 4732561
- Report Number(s):
- UCRL-10421
- Country of Publication:
- United States
- Language:
- English
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