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Parametric performance of circumferentially grooved heat pipes with homogeneous and graded-porosity slab wicks at cryogenic temperaturesA recently developed, potentially high-performance nonarterial wick has been extensively tested. This slab wick has an axially varying porosity which can be tailored to match the local stress imposed on the wick. The purpose of the tests was to establish the usefulness of the graded-porosity slab wick at cryogenic temperatures between 110 K and 260 K, with methane and ethane as working fluids. For comparison, a homogeneous (i.e., uniform porosity) slab wick was also tested. The tests included: (1) maximum heat pipe performance as a function of fluid inventory, (2) maximum performance as a function of operating temperature, (3) maximum performance as a function of evaporator elevation, and (4) influence of slab wick orientation on performance. The experimental data was compared with theoretical predictions obtained with the computer program GRADE.
Document ID
19760010237
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Groll, M. (NASA Ames Research Center Moffett Field, CA, United States)
Pittman, R. B. (NASA Ames Research Center Moffett Field, CA, United States)
Eninger, J. E. (TRW Systems Group Redondo Beach, Calif., United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1975
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-TM-X-73095
A-6405
Accession Number
76N17325
Funding Number(s)
PROJECT: RTOP 506-16-31
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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