Research Papers: Evaporation, Boiling, and Condensation

Physics of the Interaction of Ultrasonic Excitation With Nucleate Boiling

[+] Author and Article Information
Dhiman Chatterjee

e-mail: dhiman@iitm.ac.in
Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 15, 2012; final manuscript received October 3, 2013; published online November 21, 2013. Assoc. Editor: James A. Liburdy.

J. Heat Transfer 136(3), 031501 (Nov 21, 2013) (9 pages) Paper No: HT-12-1370; doi: 10.1115/1.4025641 History: Received July 15, 2012; Revised October 03, 2013

Physics of ultrasound-assisted augmentation of saturated nucleate boiling through the interaction of multiphase fluid flow is revealed in the present work. Different regimes of influence of ultrasound, ranging from augmentation to deterioration and even no effect, as reported in literature in a contradictory fashion, have been observed. However unlike the previous studies, here it has been clearly demonstrated that this apparent anomaly lies in the different natures of interactions between the influencing parameters like heat flux, ultrasonic frequency, and pressure amplitude. The present results clearly bring out an interactive effect of these operating parameters with surface parameter like surface roughness. A mechanistic model unifying all these parameters has been presented to explain quantitatively the physics of the interaction. The model-based predictions match experimental results quite well suggesting the validity of the hypothesis on liquid–vapor-surface interaction through the process of nucleation and its site density, on which the model is built, and thus revealing the underlying physics.

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Fig. 1

Schematic of pool boiling experimental setup with a zoomed view showing heat details

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Fig. 2

(a) Sectional view of the transducer assembly; (b) photograph of set up for calibrating piezoelectric transmitter

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Fig. 3

Frequency response of the ultrasonic transducer near 47 kHz. Inset figure shows the full frequency spectrum.

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Fig. 4

Variation of acoustic pressure amplitude with (a) axial distance and (b) radial distance from the transducer center. Driving frequency is 47 kHz.

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Fig. 5

Schematic of the main heater

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Fig. 6

Comparison of pool boiling data with Rohsenow correlation. Also shown boiling curve in presence of passive transducer.

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Fig. 7

Change in heat transfer coefficient because of applied acoustic field (a) 47 kHz, (b) 140 kHz, and (c) 185 kHz

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Fig. 8

Reduction in superheat requirement with increasing acoustic pressure amplitude at different heat fluxes

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Fig. 9

Variation of modeling constant B with heat flux at 47 and 140 kHz

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Fig. 10

Variation of equilibrium radius with pressure amplitude at 47, 140, and 185 kHz

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Fig. 11

Comparison of experimental data with the prediction based on the mechanistic model developed in this paper




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