We investigate the enhancement of heat transfer in the nucleate boiling regime by inducing high frequency acoustic waves (f ∼ 106 Hz) on the heated surface. In the experiments, liquid droplets (deionized water) are dispensed directly onto a heated, vibrating substrate. At lower vibration amplitudes (ξs ∼ 10−9 m), the improved heat transfer is mainly due to the detachment of vapor bubbles from the heated surface and the induced thermal mixing. Upon increasing the vibration amplitude (ξs ∼ 10−8 m), the heat transfer becomes more substantial due to the rapid bursting of vapor bubbles happening at the liquid-air interface as a consequence of capillary waves travelling in the thin liquid film between the vapor bubble and the air. Further increases then lead to rapid atomization that continues to enhance the heat transfer. An acoustic wave displacement amplitude on the order of 10−8 m with 106 Hz order frequencies is observed to produce an improvement of up to 50% reduction in the surface temperature over the case without acoustic excitation.
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January 2016
Research Article|
January 14 2016
Acoustically enhanced heat transport
Kar M. Ang;
Kar M. Ang
1School of Engineering,
Monash University Malaysia
, 47500 Bandar Sunway, Selangor, Malaysia
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Leslie Y. Yeo
;
Leslie Y. Yeo
2Micro/Nanophysics Research Laboratory,
RMIT University
, Melbourne, VIC 3001, Australia
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James R. Friend;
James R. Friend
3Department of Mechanical and Aerospace Engineering,
University of California
, San Diego, California 92093, USA
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Yew Mun Hung;
Yew Mun Hung
1School of Engineering,
Monash University Malaysia
, 47500 Bandar Sunway, Selangor, Malaysia
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Ming K. Tan
Ming K. Tan
a)
1School of Engineering,
Monash University Malaysia
, 47500 Bandar Sunway, Selangor, Malaysia
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a)
Electronic mail: tan.ming.kwang@monash.edu
Rev. Sci. Instrum. 87, 014902 (2016)
Article history
Received:
September 30 2015
Accepted:
December 28 2015
Citation
Kar M. Ang, Leslie Y. Yeo, James R. Friend, Yew Mun Hung, Ming K. Tan; Acoustically enhanced heat transport. Rev. Sci. Instrum. 1 January 2016; 87 (1): 014902. https://doi.org/10.1063/1.4939757
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