MODIFICATION OF SUPERSONIC FLOW FIELDS UNDER NEAR SPACE CONDITIONS BY CRYOPUMPING.
Technical documentary rept.,
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AIR FORCE STATION TENN
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Results are presented of a test program designed to simulate an air sampling probe utilizing cryosurfaces cooled to liquid helium temperature to capture the impinging gas. Capture coefficients are given for the liquid helium cooled cryosurface under the conditions of normally directed low density gas flow from a Mach 3 nozzle for both clean, polished surfaces and surfaces coated with a thin film of paraffin. Also presented are the effects of micron-size particles in the gas on the cryopumping capabilities of the cryosurface. Author