Accession Number:

AD0600146

Title:

TEMPERATURE EFFECTS ON THE CAPTURE COEFFICIENTS OF SIX COMMON GASES

Descriptive Note:

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

• Dawson, J. P.

Report Date:

1964-05-01

Pagination or Media Count:

47.0

Abstract:

The effects of gas and cryosurface temperature on the capture coefficient of six gases are discussed. The gas temperature effect is interpreted by the critical velocity model, and the cryosurface temperature effect is qualitatively explained by the potential field model. The possible error involved when these results are extrapolated to higher gas temperatures is also discussed. Experimental results are presented for the cryopumping rates of nitrogen, argon, carbon monoxide, nitrous oxide, oxygen, and carbon dioxide over 10 to 25 K cryosurfaces and a gas temperature range of from 77 to 400 K.

Descriptors:

• *CRYOPUMPING
• *SPACE ENVIRONMENTS
• ARGON
• CARBON COMPOUNDS
• CARBON DIOXIDE
• CRYOGENICS
• EQUATIONS
• EXPERIMENTAL DATA
• GASES
• MATHEMATICAL PREDICTION
• MOLECULAR PROPERTIES
• MONOXIDES
• NITROGEN
• NITROGEN COMPOUNDS
• OXIDES
• SURFACE TEMPERATURE
• TEMPERATURE
• TEST EQUIPMENT
• VACUUM APPARATUS
• VELOCITY

Subject Categories:

• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE