CALCULATION OF THE DIFFUSION OF SMALL PARTICLES IN A NON-UNIFORM ATMOSPHERE
The downward motion of small particles in an isothermal turbulence-free atmosphere was studied for the case of variable diffusion coefficient, utilizing two models. In the first of these, the diffusion coefficient has been taken as an exponential function of altitude while in the second, the variation has been assumed to be parabolic. In the exponential model an analytic solution for simultaneous diffusion in the vertical and horizontal directions has been obtained while for the parabolic model, an analytic solution for ertical motion only has been obtained. The calculations, hich have been restricted to the exponential case show the evelopment of a profile of constant shape, all points of which move with the same velocity, independent of the mass of the particles. These results, which are derivable from our solution, are in agreement with the numerical work of Banister and Davis. It is also shown that the qualitative nature of the results is independent of the initial distribution. (auth)
- Research Organization:
- Geophysics Corp. of America, Bedford, Mass.
- DOE Contract Number:
- DA-49-146-XZ-075
- NSA Number:
- NSA-16-033275
- OSTI ID:
- 4748701
- Report Number(s):
- GCA-TR-62-1-G; DASA-1298
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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