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Cool-down and frozen start-up behavior of a grooved water heat pipeA grooved water heat pipe was tested to study its characteristics during the cool-down and start-up periods. The water heat pipe was cooled down from the ambient temperature to below the freezing temperature of water. During the cool-down, isothermal conditions were maintained at the evaporator and adiabatic sections until the working fluid was frozen. When water was frozen along the entire heat pipe, the heat pipe was rendered inactive. The start-up of the heat pipe from this state was studied under several different operating conditions. The results show the existence of large temperature gradients between the evaporator and the condenser, and the moving of the melting front of the working fluid along the heat pipe. Successful start-up was achieved for some test cases using partial gravity assist. The start-up behavior depended largely on the operating conditions.
Document ID
19910010063
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jang, Jong Hoon (Sverdrup Technology, Inc. Brook Park, OH, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1990
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-187053
E-5923
NAS 1.26:187053
Meeting Information
Meeting: 1991 International Solar Energy Conference
Location: Reno, NV
Country: United States
Start Date: March 17, 1991
End Date: March 22, 1991
Sponsors: ASME, Japan Society of Mechanical Engineers
Accession Number
91N19376
Funding Number(s)
PROJECT: RTOP 590-13-51
CONTRACT_GRANT: NAS3-25266
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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