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Correlation for Prediction of Peak Heat Flux Achieved With a Bi-Porous Wick

[+] Author Affiliations
Ladan Amouzegar, Ivan Catton

University of California, Los Angeles, Los Angeles, CA

Aleksander Vadnjal

Pratt & Whitney Rocketdyne, Canoga Park, CA

Paper No. IMECE2009-13081, pp. 1991-1997; 7 pages
doi:10.1115/IMECE2009-13081
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

In the past researchers noted three distinct stages of evaporative heat transfer in a bi-porous wick. The maximum heat transfer rate is postulated to occur at the end of the second stage when the maximum number of small pores interfaces the vapor space. For optimization purposes a reliable model that relates the maximum heat flux of a bi-porous wick to the wick material properties, wick geometry given with average large and small pore diameter, wick thickness, and working fluid properties is demanded. In this work, a semi-empirical model that relates the heat flux at the capillary limit to the wick material properties, working fluid properties and wick dimensions is further developed. The model is based on the hydrodynamics of the capillary limit. The result is employed to qualitatively and quantitatively optimize the wick parameters for some specific cases and the optimization can be further performed using the proposed model.

Copyright © 2009 by ASME
Topics: Heat flux

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