An Experimental Study of Transient Heat Transfer From Discrete Heat Sources in Water Cooled Vertical Rectangular Channel

[+] Author and Article Information
H. Bhowmik

Department of Mechanical Engineering,  Dhaka University of Engineering and Technology (DUET), Gasipur 1700, Bangladeshhimangshu@duet.ac.bd

K. W. Tou

School of Mechanical & Aerospace Engineering,  Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798

J. Electron. Packag 127(3), 193-199 (Jul 13, 2004) (7 pages) doi:10.1115/1.1997155 History: Received March 02, 2004; Revised July 13, 2004

Experiments are performed to study the single-phase transient forced convection heat transfer on an array of 4×1 flush-mounted discrete heat sources in a vertical rectangular channel during the pump-on transient operation. Water is the coolant media and the flow covers the wide range of laminar flow regime with Reynolds number, based on heat source length, from 800 to 2625. The applied uniform heat flux ranges from 1 to 7Wcm2. For flush-mounted heaters the heat transfer characteristics are studied and correlations are presented for four chips as well as for overall data in the transient regime. The experimental results indicate that the heat transfer coefficient is affected strongly by the number of chips and the Reynolds number. Finally the general impacts of heat source protrusions (B=1, 2 mm) on heat transfer behavior of four chips are investigated by comparing the results obtained from flush-mounted (B=0) heaters.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Schematic of test facility, heaters details, and flow channel

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Figure 2

Transient temperature history

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Figure 3

Steady-state forced convection results

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Figure 4

Nusselt number and Peclet number variations with time

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Figure 5

Selection of exponent, n, for correlation

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Figure 6

Fo versus [Nuℓ∕(Peℓ)1∕3]] during the transient operation

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Figure 7

Transient results at different protrusion



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