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Capillary flow through heat-pipe wicksTheoretical expressions are obtained for the capillary-pressure limit and permeability of a fibrous wick in terms of the porosity and fiber diameter. Hysteresis in capillary pressure is included through the introduction of an empirical hysteresis constant. A partial-saturation model based on the statistical distribution of local porosity requires an additional empirical constant, the standard deviation. The theory is compared to results of a beta-ray absorption experiment that measured the liquid content of a partially saturated wick and to results of permeability measurements on partially and fully saturated wicks. A simple wick-weighing experiment is described that yields values for the empirical hysteresis constant and the standard deviation. Theoretical results are used to design an optimum wick.
Document ID
19750048847
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Eninger, J. E.
(TRW Systems Group Redondo Beach, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1975
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 75-661
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Thermophysics Conference
Location: Denver, CO
Start Date: May 27, 1975
End Date: May 29, 1975
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
75A32919
Funding Number(s)
CONTRACT_GRANT: N00019-72-C-0340
CONTRACT_GRANT: NAS2-8310
Distribution Limits
Public
Copyright
Other

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