Optimization of Synthetic Jet Fluidic Structures in Printed Wiring Boards

[+] Author and Article Information
Yong Wang, Sue Ann Bidstrup

School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0100

Guang Yuan, Yong-Kyu Yoon, Mark G. Allen

School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0100

J. Electron. Packag 128(4), 353-359 (Feb 20, 2006) (7 pages) doi:10.1115/1.2351900 History: Received May 12, 2005; Revised February 20, 2006

The active cooling substrate in this study is a microelectromechanical system device that implements the synthetic jet concept into a printed wiring board (PWB) to enhance thermal management. Synthetic jets are oscillatory jets synthesized from the surrounding fluid using electromagnetic actuators. The jet fluid mechanics and heat transfer applications have been investigated by a variety of on-board (PWB) fluidic structures. A testbed comprising six different fluidic channels has been fabricated and characterized with a standard silicon based platinum heater. Based on the fluid mechanics measurements and cooling performance tests, an empirical correlation of synthetic jet Nusselt number with its Reynolds number, fluidic channel dimensions, and jet locations has been derived. Through a magnitude analysis, jet actuator diaphragm, fluidic channel dimension, and cooling location optimizations have been investigated.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of a synthetic jet

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Figure 2

Schematic of an active cooling substrate

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Figure 3

Active cooling substrate testbed substrate

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Figure 4

Evolution of a synthetic jet (a) PIV measurement setup. (b) PIV image at t∕T=0 (c) PIV image at t∕T=0.17 (d) PIV image at t∕T=0.33. (e) PIV image at t∕T=0.50 (f) PIV image at t∕T=0.66 (g) PIV image at t∕T=0.83.

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Figure 5

Centerline velocity for 8.46-mm-wide channel at 0.8mm away from exit

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Figure 6

Temperature contour on PWB substrate in one cooling test cycle (a) without jet, heater at 100°C, (b) with jet, heater at 70°C (c), and with jet, heater at 100°C

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Figure 7

Local heat transfer coefficient along the jet centerline

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Figure 8

The fluidic channel width impacts on heat transfer

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Figure 9

Heat transfer coefficient vs normalized channel width at 15.24mm away from the jet exit



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