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Research Papers

Heat Transfer Enhancement for Blocks in a Channel Using a Rotationally Oscillating Plate

[+] Author and Article Information
Esam M. Alawadhi

Department of Mechanical Engineering,
Kuwait University,
P.O. Box 5969,
Safat 13060, Kuwait

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received June 6, 2013; final manuscript received March 1, 2014; published online May 5, 2014. Assoc. Editor: Siddharth Bhopte.

J. Electron. Packag 136(3), 031003 (May 05, 2014) (6 pages) Paper No: EP-13-1046; doi: 10.1115/1.4027090 History: Received June 06, 2013; Revised March 01, 2014

Heat transfer enhancement using a rotationally oscillating plate in a channel containing heated blocks is numerically studied. The blocks simulate electronic chips with a high thermal dissipation rate. The model consists of a channel formed by two plates with heated blocks attached to bottom walls and a plate installed at the centerline of the channel. The rotationally oscillating plate enhances heat transfer from the blocks through the flow accelerating above the blocks. The effect of the frequency and maximum angle of attack of the plate on the Nusselt number is investigated for different Reynolds numbers. Heat transfer enhancement of the blocks with the plate is evaluated by comparing their thermal characteristics to a channel without plate. The results show that the oscillating plate enhances overall heat flow out of the blocks by 21.72% but with significant pressure drop of 300%.

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Figures

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Fig. 1

Schematic diagram of the problem

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Fig. 2

Finite element mesh of the computational domain

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Fig. 3

The local Nusselt number of the present and Young and Vafai [2] results for first second block for Re = 800

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Fig. 4

Instantaneous average Nusselt number for the (a) first, (b) second, and (c) third block, for Re = 500, Lp*= 1.5, F = 1/2500, and different maximum plate angle

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Fig. 5

Nusselt number enhancement for the (a) first, (b) second, and (c) third block, for Re = 500, Lp*= 1.5, F = 1/2500, and different maximum plate angle

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Fig. 6

Nusselt number enhancement for all blocks and pressure drop across the channel, Lp*= 1.5, F = 1/2500, and different maximum plate angle

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