Accession Number : AD0487388

Title :   CAPTURE COEFFICIENTS OF CARBON DIOXIDE AND NITROGEN GAS ON A CRYOGENIC COOLED SURFACE.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Tedeschi, Louis Carmelo

Report Date : MAY 1966

Pagination or Media Count : 90

Abstract : Capture coefficients of CO2 and N2 were measured on a flat cryopanel. The cryopumping of 300 K CO2 on an 85 K surface resulted in a capture coefficient of 0.58 while for 300 K N2 on a 33 K surface a coefficient of 0.65 was measured. The pressure drop method employed to measure the above capture coefficients was studied to account for vapor pressure, temperature corrections, and assumptions which must be made in the calculation of the capture coefficient. An analog model of the actual system was capable of predicting system pressure responses. Instrumentation and construction of gaseous helium transfer lines necessary to effect the above measurements are also discussed. (Author)

Descriptors :   *CARBON DIOXIDE), (*CRYOPUMPING, NITROGEN, PRESSURE, VAPOR PRESSURE, HELIUM, CRYOGENICS, CONDENSATION REACTIONS, SPACE SIMULATION CHAMBERS, GAS FLOW.

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE