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Report
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NASA Technical Note
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Evaluation of Packed Distillation Columns
The evaluation indicated that of packings used in glass distillation columns, Heli-Grid was most efficient and of packings used in steel distillation columns, steel helices were most efficient.
Free-molecule Flow and Surface Diffusion Through Slots and Tubes
Theoretical analyses have been conducted dealing with free-molecule gas flow through tubes and two-dimensional slots. Diffuse reemission from the walls has been assumed. Models investigated include converging and diverging slots and tubes as well as parallel-walled slots and cylindrical tubes. For the parallel-walled slots and cylindrical tubes, effects of both free-molecule flow and surface diffusion were studied. The results are summarized in this report. The pertinent integral equations, developed from classical kinetic theory are presented as are other important relations covering various transmission factors.
Annual Report - National Advisory Committee for Aeronautics
Includes the Committee's Technical reports no. 1-1058, reprinted in v. 1-37.
