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Contamination of liquid oxygen by pressurized gaseous nitrogenThe penetration of pressurized gaseous nitrogen (GN2) into liquid oxygen (LOX) was investigated experimentally in the 7-inch High Temperature Tunnel, the pilot tunnel for the 8-foot High Temperature Tunnel (8'HTT) at Langley Research Center. A preliminary test using a nuclear monitor revealed the extent of the liquid nitrogen (LN2) build-up at the LOX interface as a function of GN2 pressure. Then an adaptation of the differential flash vaporization technique was used to determine the binary diffusivity of the LOX-LN2 system at a temperature of 90.2 K. The measured value D equals 0.000086 sq cm/s + or - 25 percent together with two prior measurements at lower temperatures revealed an excellent fit to the Arrhenius equation, yielding a pre-exponential factor D sub 0 equals 0.0452 sq cm/s and an activation enthalpy H equals 1.08 kcal/mol. At a pressure of 1700 psi and holding time of 15 min, the penetration of LN2 into LOX (to a 1 percent contamination level) was found to be 0.9 cm, indicating but minimal impact upon 8'HTT operations.
Document ID
19890010128
Document Type
Technical Publication (TP)
Authors
Zuckerwar, Allan J. (Old Dominion Univ. Norfolk, VA., United States)
King, Tracy K. (NASA Langley Research Center Hampton, VA, United States)
Ngo, Kim Chi (Old Dominion Univ. Norfolk, VA., United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1989
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number
L-16526
NASA-TP-2894
NAS 1.60:2894
Funding Number(s)
PROJECT: RTOP 505-43-31-05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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