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.

Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

Schematic of flow loop and test system

Grahic Jump Location
Fig. 2

Test module exploded view (insulation blocks not shown)

Grahic Jump Location
Fig. 3

Test module assembly

Grahic Jump Location
Fig. 4

Schematic of the jet array and their position

Grahic Jump Location
Fig. 5

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

Grahic Jump Location
Fig. 6

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

Grahic Jump Location
Fig. 7

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

Grahic Jump Location
Fig. 8

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

Grahic Jump Location
Fig. 9

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

Grahic Jump Location
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.

Grahic Jump Location
Fig. 11

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




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In