This is Paper I of a two-part study concerning thermal and hydrodynamic characteristics of liquid single-phase flow in an array of micro-pin-fins. This paper reports the heat transfer results of the study. An array of 1950 staggered square micro-pin-fins with cross-section by height were fabricated into a copper test section. De-ionized water was used as the cooling liquid. Two coolant inlet temperatures of and and six maximum mass velocities for each inlet temperature ranging from 183 to were tested. The corresponding inlet Reynolds number ranged from 45.9 to 179.6. General characteristics of average and local heat transfer were described. Six previous conventional long and intermediate pin-fin correlations and two micro-pin-fin correlations were examined and were found to overpredict the average Nusselt number data. Two new heat transfer correlations were proposed for the average heat transfer based on the present data, in which the average Nusselt number is correlated with the average Reynolds number by power law. Values of the exponent of the Reynolds number for the two new correlations are fairly close to those for the two previous micro-pin-fin correlations but substantially higher than those for the previous conventional pin-fin correlations, indicating a stronger dependence of the Nusselt number on the Reynolds number in micro-pin-fin arrays. The correlations developed for the average Nusselt number can adequately predict the local Nusselt number data.
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December 2008
This article was originally published in
Journal of Heat Transfer
Research Papers
Liquid Single-Phase Flow in an Array of Micro-Pin-Fins—Part I: Heat Transfer Characteristics
Weilin Qu,
Weilin Qu
Department of Mechanical Engineering,
e-mail: qu@hawaii.edu
University of Hawaii at Manoa
, Honolulu
, HI 96822
Search for other works by this author on:
Abel Siu-Ho
Abel Siu-Ho
Department of Mechanical Engineering,
University of Hawaii at Manoa
, Honolulu
, HI 96822
Search for other works by this author on:
Weilin Qu
Department of Mechanical Engineering,
University of Hawaii at Manoa
, Honolulu
, HI 96822e-mail: qu@hawaii.edu
Abel Siu-Ho
Department of Mechanical Engineering,
University of Hawaii at Manoa
, Honolulu
, HI 96822J. Heat Transfer. Dec 2008, 130(12): 122402 (11 pages)
Published Online: September 17, 2008
Article history
Received:
September 11, 2007
Revised:
March 4, 2008
Published:
September 17, 2008
Connected Content
A companion article has been published:
Liquid Single-Phase Flow in an Array of Micro-Pin-Fins—Part II: Pressure Drop Characteristics
Citation
Qu, W., and Siu-Ho, A. (September 17, 2008). "Liquid Single-Phase Flow in an Array of Micro-Pin-Fins—Part I: Heat Transfer Characteristics." ASME. J. Heat Transfer. December 2008; 130(12): 122402. https://doi.org/10.1115/1.2970080
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