Accession Number : AD0428497


Title :   TEMPERATURE EFFECTS ON THE CAPTURE COEFFICIENT OF CO2,


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


Personal Author(s) : Dawson,J P ; Haygood,J D


Report Date : Jan 1964


Pagination or Media Count : 28


Abstract : Results are presented for the second phase of an experimental program designed to study the effects of gas and cryosurface temperatures on the capture coefficients in cryopumping. Experimental pumping speeds and capture coefficients were obtained for 195, 300 and 400 K carbon dioxide on a spherical cryosurface with temperatures ranging from 12 to 77 K. These measurements cover a pressure range of 10 to the -8th power to 10 1/100,000 mm Hg. Based on a potential well-energy barrier molecular model, an empirical equation is developed and found to correlate well with the experimental results. The cryopumping research program is to improve the quality of vacuum obtained in space simulated chambers and to predict chamber conditions during a test phase. (Author)


Descriptors :   *SPACE(ROOM) , *CARBON DIOXIDE , PUMPS , TEST METHODS , VACUUM PUMPS , PRESSURE , GASES , TEMPERATURE , SURFACE TEMPERATURE , THERMODYNAMICS , ARGON , NITROGEN , SIMULATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE