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- W2254555630 abstract "Studies were made on a proposal that improvement in operation of thermal diffusion equipment might result if the thermal and hydrodynamic behavior could be controlled independently. The procedure employed was to pass a gaseous mixture past a heated, flat, porous plate to which suction was being applied. In this manner the gas near the plate, rich in one component because of thermal diffusion, was continuously removed. Since boundary layers exhibit steep temperature gradients it was expected that measurable separations would be achieved with a surface of minimum size. This was found to be the case. Separations greater than one per cent enrichment in the lighter component were observed. The gaseous system used for the investigation was helium and nitrogen. The variables that were found to be most important with respect to affecting the separation were the tangential velocity, the suction velocity, the plate temperature, the length of the plate undergoing suction, and turbulence in the boundary layer. It was found that the separations were greater for increased plate temperature, decreased tangential velocity, decreased suction velocity, and decreased plate length. Induced turbulence was found to have little or no effect on the separations. The data showed that the separations achieved didmore » not conform to the mathematical analysis that was made on the assumption of an idealized, rod-like velocity distribution. In some runs the observed separations were nearly twice as great as expected and were almost as large as would have been obtained at stationary conditions in a fluid mixture held motionless between adjacent hot and cold surfaces. It was concluded that the mathematical theory presented did not adequately represent the physical circumstances. It was further concluded that energy efficiencies for the process may be greater than predicted from theory and that the process might be attractive when energy usage is critical. (auth)« less" @default.
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- W2254555630 date "1961-06-01" @default.
- W2254555630 modified "2023-09-26" @default.
- W2254555630 title "SEPARATION OF GASES BY THERMAL DIFFUSION USING BOUNDARY LAYER SUCTION. Final Report" @default.
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