Study investigates effects of helium and nitrogen as pressurants in nitrogen tetroxide transfer from one vessel to another at a higher elevation. Results may contribute to creation of new environmental systems and improved oxygen solubility in water to promote fish life

Bizjak, F.

Simkin, D. J.

English

NASA Technical Reports Server

April 1967	 Brief 67-10083 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
,ffects of Helium and Nitrogen as Pressurants in Nitrogen Tetroxide Transfer 
A determination is required as to the effects of 
helium and nitrogen on a mass of nitrogen tetroxide 
during their use as pressurants to transfer the N204 
from one vessel to another at a higher elevation. It is 
desired to study the thermodynamics of N20 1 plus the 
solubility and effervescence of He and N2 in N204, 
MMH, and Aerozine 50. Special attention is given to 
the effects of pressure and temperature on the inter- 
relation. 
' In the study of thermodynamic properties of N204, 
experimental data and thermodynamic correlations are 
employed. Temperature-entropy, temperature-enthal-
py, and temperature-pressure-volume plots are de-
veloped. A method is also developed to predict ther-
modynamic properties of compounds that dissociate. 
In the investigation to determine solubility of He 
and N2 in N204 , MMH, and Aerozine 50 as a func-
tion of temperature and propellant gas pressure, 
Henry's law is used. Increase of solubility with tem-
perature and as a function of similarity (N204—N2) 
are observed.
Notes: 
1. These data may contribute to creation of new 
environmental systems: improved oxygen solubility 
in water to promote fish life; use of helium in 
breathing to control gas effervescence from blood 
during decompression. 
2. Inquiries concerning these studies may be di-
rected to: 
Technology Utilization Officer.,, 
Manned Spacecraft Center 
-	 Houston, Texas 77058 
Reference: B67-10083 
I 
Patent status: 
No patent action is contemplated by NASA. 
Source: Frank Bizjak and D. J. Simkin 
of North American Aviation, Inc. 
under contract to 
Manned Spacecraft Center 
(MSC-924 & 925) 
Category 03 
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.
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Effects of helium and nitrogen as pressurants in nitrogen tetroxide transfer

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