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Research Papers

Active Heat Transfer Enhancement in Single-Phase Microchannels by Using Synthetic Jets

[+] Author and Article Information
Ruixian Fang

e-mail: fangr@cec.sc.edu

Jamil A. Khan

e-mail: khan@cec.sc.edu
Department of Mechanical Engineering,
University of South Carolina,
Columbia, SC 29208

1Corresponding author.

Manuscript received July 4, 2012; final manuscript received October 8, 2012; published online February 22, 2013. Assoc. Editor: Mehmet Arik.

J. Thermal Sci. Eng. Appl 5(1), 011006 (Feb 22, 2013) (8 pages) Paper No: TSEA-12-1102; doi: 10.1115/1.4007916 History: Received July 04, 2012; Revised October 08, 2012

The present work experimentally investigates the effect of synthetic jets on the heat transfer performance in a microchannel heat sink. The heat sink consists of five parallel rectangular microchannels measuring 500 μm wide, 500 μm deep, and 26 mm long each. An array of synthetic jets with 100 μm diameter orifices is placed right above the microchannel with a total of eight jet orifices per channel. Microjets are synthesized from the fluid flowing through the microchannel. Periodic disturbances are generated when the synthetic jets interact with the microchannel flow. Heat transfer performance is enhanced as local turbulence is generated and penetrates the thermal boundary layer near heated channel wall. The effects of synthetic jets on microchannels heat transfer performance are studied for several parameters including the channel stream flow rate, the synthetic jets strength and operating frequency. It shows that the synthetic jets have higher heat transfer enhancement for microchannel flow at lower channel flow rates. A maximum of 130% heat transfer enhancement is achieved for some test cases. The pressure dynamics introduced by the synthetic jets are also investigated. The synthetic jets cause a minor increase in the pressure drop.

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References

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Figures

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Fig. 1

Schematic of flow loop and test system

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Fig. 2

Test module exploded view (insulation blocks not shown)

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Fig. 3

Test module assembly

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Fig. 4

Schematic of the jet array and their position

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Fig. 5

Effect of synthetic jets at different channel flow rate. Jet actuator driving frequency = 80 Hz, driving voltage = 160 Vp.

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Fig. 6

Thermal effects of the jets driving voltage. Channel flow Re = 282, jets frequency = 80 Hz.

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Fig. 7

Effect of synthetic jets strength. Jet actuator driving frequency = 80 Hz with the driving voltage = 120 Vp and 160 Vp, respectively.

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Fig. 8

Effect of synthetic jets frequency. Channel flow Re = 282. Jet actuator driving voltage = 80 Vp and 160 Vp, respectively.

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Fig. 9

Pressure variations without synthetic jets. Channel flow Re = 467.

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Fig. 10

Pressure variations with synthetic jets. Channel flow Re = 467, jet actuator driving frequency = 80 Hz, with driving voltage = 80 Vp and 160 Vp, respectively.

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Fig. 11

Effect of synthetic jets on pressure drops. Jet actuator driving voltage = 80 Vp, frequency = 80 Hz.

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