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Hot wire/film behavior in low-temperature gasesCommercially available hot wires/films were used to measure the velocities of evaporated hydrogen or helium gas during cryogenic mixing experiments. Hot wires were found to be too delicate to use in this harsh environment. Hot films were rugged enough to use at cryogenic temperatures even though they failed after a number of thermal cycles. Since the hot films have small aspect ratios, 13.4 and 20, they are quite sensitive to the thermal loading, Tw/Tg, even with a correction for the conduction end loss. In general, although the increase of the Nusselt number with Reynolds number at low temperatures was similar to that at room temperature, there was also a pronounced variation with Tw/Tg over the large range of 1.2 to 12 investigated.
Document ID
19930034562
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kwack, E. Y.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shakkottai, P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Luchik, T. S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Aaron, K. M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Fabris, G.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Back, L. H.
(JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1992
Publication Information
Publication: ASME, Transactions, Journal of Heat Transfer
Volume: 114
Issue: 4
ISSN: 0022-1481
Subject Category
Instrumentation And Photography
Accession Number
93A18559
Distribution Limits
Public
Copyright
Other

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