Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Basic Mechanisms of Noncondensable Gas Cryotrapping

Report Number: AEDC TDR 63-147
Corporate Author: General Technology Corporation
Date of Publication: 1963-07
Pages: 58
Contract: AF 40(600)-941
Project: 6950
Task: 695001
AD Number: AD0410735

Abstract:
Systematic measurements are reported on the rate at which argon and nitrogen are trapped by water as it condenses under vacuum onto a 77 K surface. For condensation rates between 10 to the 15th power and 10 to the 18th power molecules per sq. cm -sec. and noncondensable partial pressures between 0.000001 and 0.1 torr, trapping rates are proportional to condensation rate and a concen tration of adsorbed gas. The latter are described by Langmuir isotherms with characteristic pres sures for saturation of 0.0025 torr and 0.0035 torr for nitrogen and argon respectively. Inde pendent adsorption measurements show that quantity of gas adsorbed is proportional to mass of con densate (approximately 600 sq. meters per gram) and depends on pressure identically with the trap ping. Apparent trapping due to adsorption on surface area generated during condensation is only about 7% of actual trapping. All the results are consistent with a mixed phase for the con densate of which approximately 10% is the 12A gas hydrate.


Provenance:
IIT
This report has yet to be scanned by Contrails staff

Request scanning of this report

Other options for obtaining this report

Via the Defense Technical Information Center (DTIC):
A record for this report, and possibly a full-image download of the report, exists at DTIC

Via National Technical Information Service:
This report may have been digitized and made freely available for public download, or made publicly available for purchase by the National Technical Information Service through their online database, the National Technical Reports Library

Indications of Public Availability
No digital image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement