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Heat Transfer Enhancement

Predicting Heat Transfer From Unsteady Synthetic Jets

[+] Author and Article Information
Mehmet Arik1

School of Engineering, Ozyegin University, Cekmekoy, İstanbul, Turkeymarik06@gmail.com

Tunc Icoz

General Electric Company, Global Research Center, Thermal Systems Laboratory, Niskayuna, NY 12309

1

Corresponding author.

J. Heat Transfer 134(8), 081901 (May 31, 2012) (8 pages) doi:10.1115/1.4005740 History: Received November 13, 2009; Accepted October 05, 2011; Published May 31, 2012; Online May 31, 2012

Synthetic jets are piezo-driven, small-scale, pulsating devices capable of producing highly turbulent jets formed by periodic entrainment and expulsion of the fluid in which they are embedded. The compactness of these devices accompanied by high air velocities provides an exciting opportunity to significantly reduce the size of thermal management systems in electronic packages. A number of researchers have shown the implementations of synthetic jets on heat transfer applications; however, there exists no correlation to analytically predict the heat transfer coefficient for such applications. A closed form correlation was developed to predict the heat transfer coefficient as a function of jet geometry, position, and operating conditions for impinging flow based on experimental data. The proposed correlation was shown to predict the synthetic jet impingement heat transfer within 25% accuracy for a wide range of operating conditions and geometrical variables.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Typical operation of a synthetic jet

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Figure 2

GE GRC Synthetic jet test rig

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Figure 3

Close up view of synthetic jet and the vertical heater

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Figure 4

Heater construction

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Figure 5

Heater temperature rise with heat rejection

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Figure 6

Illustration of pressure measurement setup

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Figure 7

Pressure measurement test rig

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Figure 8

Variation of instantaneous jet exit velocities for 8 mm jet at 60 V and 600 Hz

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Figure 9

Variation of peak jet exit velocities for 8 mm orifice jet

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Figure 10

Variation of peak jet exit velocities for a 15 mm orifice synthetic jet

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Figure 11

Variation of synthetic jet peak exit velocities versus peak internal pressure for an 8 mm orifice

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Figure 12

Variation of average Nu number with dimensionless driving frequency for an 8 mm orifice jet at 40 V

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Figure 13

Variation of average Nu number with dimensionless driving frequency for an 8 mm orifice jet at 60 V

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Figure 14

Variation of average Nu number with dimensionless driving frequency for a 15 mm orifice jet at 40 V

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Figure 15

Variation of average Nu number with dimensionless driving frequency for a 15 mm orifice jet at 60 V

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Figure 16

Nu number as a function of hydraulic diameter at two driving voltages and z/Dh  = 10 and at 600 Hz

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Figure 17

Nu number as a function of hydraulic diameter at two driving voltages and z/Dh = 20 and at 600 Hz

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Figure 18

Nu as a function of z/Dh at two driving voltages and z/Dh ratios with 8 mm orifice at 600 Hz

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Figure 19

Nu as a function of z/Dh at two driving voltages and z/Dh ratios with 15 mm orifice at 600 Hz

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Figure 20

Variation of predicted and measured average Nu numbers with ± 25% boundaries

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