Meso Scale Pulsating Jets for Electronics Cooling

[+] Author and Article Information
Jivtesh Garg, Mehmet Arik, Todd Wetzel

 GE Global Research Center, Thermal Systems Laboratory, Niskayuna, NY 12309

Stanton Weaver

 GE Global Research Center, Micro and Nano Structures Technology Lab, Niskayuna, NY 12309

Seyed Saddoughi

 GE Global Research Center, Propulsion Technologies Laboratory, Niskayuna, NY 12309

J. Electron. Packag 127(4), 503-511 (Apr 20, 2005) (9 pages) doi:10.1115/1.2065727 History: Received October 11, 2004; Revised April 20, 2005

Microfluid devices are conventionally used for boundary layer control in many aerospace applications. Synthetic jets are intense small-scale turbulent jets formed from periodic entrainment and expulsion of the fluid in which they are embedded. The jets can be made to impinge upon electronic components thereby providing forced convection impingement cooling. The small size of these devices accompanied by the high exit air velocity provides an exciting opportunity to significantly reduce the size of thermal management hardware in electronics. A proprietary meso scale synthetic jet designed at GE Global Research is able to provide a maximum air velocity of 90ms from a 0.85 mm hydraulic diameter rectangular orifice. An experimental study for determining the cooling performance of synthetic jets was carried out by using a single jet to cool a thin foil heater. The heat transfer augmentation caused by the jets depends on several parameters, such as, driving frequency, driving voltage, jet axial distance, heater size, and heat flux. During the experiments, the operating frequency for the jets was varied between 3.4 and 5.4 kHz, while the driving voltage was varied between 50 and 90VRMS. Two different heater powers, corresponding to approximately 50 and 80 °C, were tested. A square heater with a surface area of 156mm2 was used to mimic the hot component and detailed temperature measurements were obtained with a microscopic infrared thermal imaging technique. A maximum heat transfer enhancement of approximately 10 times over natural convection was measured. The maximum measured coefficient of performance was approximately 3.25 due to the low power consumption of the synthetic jets.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Schematic of the heater arrangement

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Figure 2

Digital image of the jet side

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Figure 3

Digital image of the camera side

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Figure 4

IR image at high temperature

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Figure 5

Transmissivity calibration

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Figure 6

Typical velocity response of a synthetic jet

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Figure 7

Variation of the exhaust velocity with driving voltage

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Figure 8

Temperature distribution under natural convection condition for lower heat flux

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Figure 9

Variation of the temperature rise with jet axial distance for low heat flux case

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Figure 10

Temperature profile under natural convection for high heat flux case

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Figure 11

Heater temperature profile with the jet on (V=50V, Distance=8mm)

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Figure 12

Variation of the temperature rise with jet axial distance for high heat flux

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Figure 13

Enhancement factor for lower heat flux case

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Figure 14

Enhancement factor for higher heat flux case

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Figure 15

Predicted and experimental heat transfer coefficients




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