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Maximum two-phase flow rates of subcooled nitrogen through a sharp-edged orificeAn experiment was conducted and data are presented in which subcooled liquid nitrogen was discharged through a sharp-edged orifice at flow rates near the maximum. The data covered a range of inlet stagnation pressure from slightly above saturation to twice the thermodynamic critical pressure. The data were taken along five separate inlet stagnation isotherms ranging from 0.75 to 1.035 times the thermodynamic critical temperature. The results indicate that: (1) subcooled liquids do not choke or approach maximum flow in an asymptotic manner even though the back pressure is well below saturation; (2) orifice flow coefficients are not constant as is frequently assumed. A metastable jet appears to exist which breaks down if the difference between back pressure and saturation pressure is large enough.
Document ID
19750057997
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Simoneau, R. J.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
July 1, 1975
Subject Category
Engineering (General)
Meeting Information
Meeting: Cryogenic Engineering Conference, Kingston
Location: Ontario
Country: Canada
Start Date: July 22, 1975
End Date: July 25, 1975
Accession Number
75A42069
Distribution Limits
Public
Copyright
Other

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