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Study of experiments on condensation of nitrogen by homogeneous nucleation at states modelling those on the national transonic facilityA cryogenic wind tunnel is based on the twofold idea of lowering drive power and increasing Reynolds number by operating with nitrogen near its boiling point. There are two possible types of condensation problems involved in this mode of wind tunnel operation. They concern the expansion from the nozzle supply to the test section at relatively low cooling rates, and secondly the expansion around models in the test section. This secondary expansion involves higher cooling rates and shorter time scales. In addition to these two condensation problems it is not certain what purity of nitrogen can be achieved in a large facility. Therefore, one cannot rule out condensation processes other than those of homogeneous nucleation.
Document ID
19800016801
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Wegener, P. P. (Yale Univ. New Haven, CT, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1980
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-163217
Accession Number
80N25294
Funding Number(s)
CONTRACT_GRANT: NSG-1612
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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