Accession Number : AD0264295

Title :   GENERAL CRYOPUMPING STUDY

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

Personal Author(s) : WANG,E.S.J. ; COLLINS,J.A. JR. ; HAYGOOD,J.D.

Report Date : OCT 1961

Pagination or Media Count : 1

Abstract : The general techniques of cryogenic pumping and their application to space environmental imulation are discussed. A theoretical analysis based on the kinetic theory of gases is presented which leads to a definition of the capture coefficient and a determination of the relationship between the capture coefficient and the thermal accommodation coefficient. Experimental results are presented for the cryopumping rates of carbon dioxide and water on a surface cooled by liquid nitrogen. The trapping of nitrogen by water and carbon dioxide is also discussed, and some effects of surface configuration on the cryopumping rate are shown. (Author)

Descriptors :   *CRYOGENICS, *SPACE ENVIRONMENTS, CARBON DIOXIDE, COOLING, GASES, KINETIC THEORY, LIQUEFIED GASES, NITROGEN, SIMULATION, SURFACES, TEST EQUIPMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE