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A study of circumferentially-heated and block-heated heat pipes. I - Experimental analysis and generalized analytical prediction of capillary limits. II - Three-dimensional numerical modeling as a conjugate problemThe wall and centerline vapor temperatures and heat output are determined experimentally for a low-temperature copper-water heat pipe under uniform circumferential heating and block heating. The time required to reach a vapor temperature of 60 C from an initial ambient temperature of 21 C is determined for both modes of heating. The experimental capillary limit of the heat pipe is compared to the generalized capillary limits for block-heated pipes over a range of vapor temperatures. A three-dimensional numerical model is then developed for determining the temperature, pressure, and velocity distributions in the entire domain of a circumferentially heated and a block-heated pipe. The problem is formulated as a conjugate problem, without the assumption of a uniform vapor temperature. The predictions of the model are found to be in good agreement with the experimental data.
Document ID
19930037718
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schmalhofer, Joseph
(NASA Lewis Research Center Cleveland, OH, United States)
Faghri, Amir
(Wright State Univ. Dayton, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: International Journal of Heat and Mass Transfer
Volume: 36
Issue: 1
ISSN: 0017-9310
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93A21715
Funding Number(s)
CONTRACT_GRANT: F33615-89-C-2820
Distribution Limits
Public
Copyright
Other

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