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Convective heat flow in space cryogenics plugs - Critical and moderate He II heat flux densitiesPlug flow rates of entropy, heat and normal fluid in phase separators and in zero net mass flow systems are, to some extent, quite similar. A simplified analysis of critical conditions is presented in agreement with data trends. A critical temperature gradient arises on the basis of the He II two-fluid model at the stability limit constraining the thermohydrodynamics of the system. Thus, the question of critical thermodynamic fluctuations associated with nucleation versus the possibility of critical gradients in externally imposed parameters is answered in favor of the latter route toward turbulence. Furthermore, a similarity equation is presented which incorporates size dependent rates for moderate heat flow densities observed in experiments.
Document ID
19900048550
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Yuan, S. W. K.
(Lockheed Research Laboratories Palo Alto, CA, United States)
Frederking, T. H. K.
(California, University Los Angeles, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Cryogenics
Volume: 30
ISSN: 0011-2275
Subject Category
Engineering (General)
Accession Number
90A35605
Distribution Limits
Public
Copyright
Other

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