TECHNICAL PAPERS: Electronic Cooling

Forced Convection Heat Transfer From a Low-Profile Block Simulating a Package of Electronic Equipment

[+] Author and Article Information
Hajime Nakamura, Tamotsu Igarashi

Department of Mechanical Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan

J. Heat Transfer 126(3), 463-470 (Jun 16, 2004) (8 pages) doi:10.1115/1.1737776 History: Received May 16, 2003; Revised February 25, 2004; Online June 16, 2004
Copyright © 2004 by ASME
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Schematic diagram of duct equipment for (a) Um=0.24–0.72 m/s,HD=10 mm, and (b) Um=1–4 m/s,HD=3.8–10 mm
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Test model for heat transfer measurement under conditions of constant heat flux: (a) cross-sectional view of rectangular duct, (b) schematic of test model
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Cross-sectional view of rectangular duct for heat transfer measurement under conditions of constant wall temperature
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Distribution of mean and fluctuating velocities in the rectangular duct at z=0: (left) Mean velocity ū/Um, (right) fluctuating velocity u′2/Um. (a) HD=10 mm,Um=1.0 m/s,ReDh=1220, (b) HD=10 mm,Um=3.5 m/s,ReDh=4270, (c) HD=5.5 mm,Um=1.0 m/s,ReDh=690, and (d) HD=5.5 mm,Um=3.5 m/s,ReDh=2400.
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Contours of temperature difference Tw−T0 for the constant heat-flux model measured by infrared camera: (a) heated surface, (b) HD=10 mm,Um=0.24 m/s,q̇in=187 W/m2, (c) HD=10 mm,Um=1.0 m/s,q̇in=239 W/m2, (d) HD=10 mm,Um=3.5 m/s,q̇in=412 W/m2, (e) HD=5.5 mm,Um=1.0 m/s,q̇in=239 W/m2, and (f) HD=5.5 mm,Um=3.5 m/s,q̇in=411 W/m2
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Distribution of heat transfer coefficient on the top face of the block for the constant heat flux model at z=0: (a) heated surface, (b) effect of duct velocity Um, and (c) effect of duct height HD
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Generalization of the heat transfer distribution: (a) effect of duct velocity Um, and (b) effect of duct height HD
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Relationships between the average Nusselt number Num and the modified Reynolds number: (a) based on hydraulic diameter of duct, ReDh*, and (b) based on the side length of block, ReL*
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Comparison of the present correlation Eq. (12) with previous research



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