Accession Number : AD0431229

Title :   CRYOPUMPING OF NITROUS OXIDE,

Corporate Author : ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AIR FORCE STATION TENN

Personal Author(s) : Brown,R. F.

Report Date : FEB 1964

Pagination or Media Count : 28

Abstract : An experimental study of the pumping speed of N2O at 77 K is presented. It is shown that the pumping speed remains constant in the freemolecular flow region, increases in the lower transition region, and then declines very rapidly as the pressure is further increased. The rapid decline in pumping speed in the higher pressure region is caused by the combined effects of the noncondensable gas present in the system and thermal overloading of the cryosurface. However, the exact contribution of each has not been determined. (Author)

Descriptors :   (*FLUID MECHANICS, LOW TEMPERATURE), (*FLUID FLOW, LOW PRESSURE), FLUID DYNAMICS, NITROGEN COMPOUNDS, OXIDES, CARBON DIOXIDE, VACUUM PUMPS, TRANSITION TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE