From the experiments performed in study, it was determined that oxygen transferred at ambient temperature and pressures up to 10,000 psig consistently dropped in temperature. All results therefore indicate that gaseous oxygen transferred at ambient temperature does not exhibit Joule-Thomson inversion below 10,000 psig

Schumann, E. R.

English

NASA Technical Reports Server

April 1974	 .	 B73-10483 
NASA TECH BRIEF 
John F Kennedy Space Center 	 Ij,?11 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Transfer of Gaseous Oxygen From High-Pressure Containers 
and the Joule-Thomson Inversion 
.
The Joule-Thomson inversion associated with the 
transfer of gaseous oxygen from high-pressure containers 
has not been explored beyond pressure of 5000 psig 
(34.4x10 6 N/rn2 ). As a result, a study was performed to 
determine this point in the 3000- to 10,000-psig 
(20.6x106 - to 68.9x106 -N/m2 ) pressure range at flow 
rates ranging from 24.5 to 1300 standard cubic feet per 
minute (0.7 to 36.8 M3 /min). The transfer process in 
this study was assumed to be a constant enthalpy 
throttling process. 
Normally, when gases are throttled at high pressures, 
there is a drop in temperature in the downstream gas. 
This occurs when Joule-Thomson coefficient p is posi-
tive. However, at sufficiently-high upstream pressures, 
the coefficient can become negative and the gas will heat 
up. The pressure and temperature at which p changes 
signs is the Joule-Thomson inversion point. 
From the experiments performed in the study, it was 
determined that oxygen transferred at ambient tempera-
ture and pressures up to 10,000 psig (68.9x10 6 N/rn2) 
consistently dropped in temperature. All results therefore
indicate that gaseous oxygen transferred at ambient 
temperature does not exhibit the Joule-Thomson in-
version below 10,000 psig. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Kennedy Space Center 
Code AD-PAT 
Kennedy Space Center, Florida 32899 
Reference: B73-10483 
Patent status: 
NASA has decided not to apply for a patent. 
Source: Addison L. Bain of
Kennedy Space Center
and Eugene R. Schumann of 
Bendix Corp.

under contract to

Kennedy Space Center
(KSC-1072 1) 
Category 03, 04 
• 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
I
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Transfer of gaseous oxygen from high-pressure containers and the Joule-Thomson inversion

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