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Enhancement of Natural Convection and Pool Boiling Heat Transfer via Ultrasonic Vibration

[+] Author Affiliations
Ho-Young Kim, Yi Gu Kim

Korea Institute of Science and Technology, Seoul, Korea

Byung Ha Kang

Kookmin University, Seoul, Korea

Paper No. HT2003-47131, pp. 295-302; 8 pages
doi:10.1115/HT2003-47131
From:
  • ASME 2003 Heat Transfer Summer Conference
  • Heat Transfer: Volume 2
  • Las Vegas, Nevada, USA, July 21–23, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3694-0 | eISBN: 0-7918-3679-7
  • Copyright © 2003 by ASME

abstract

This work experimentally studies the fundamental mechanism by which the ultrasonic vibration enhances natural convection and pool boiling heat transfer. A thin platinum wire is used as both a heat source and a temperature sensor. A high speed video imaging system is employed to observe the behavior of cavitation and thermal bubbles. Experimental results show that the effects of ultrasonic vibration on flow behavior are vastly different depending on the heat transfer regime and the amount of dissolved gas. In the natural convection and subcooled boiling regimes, behavior of cavitation bubbles strongly affects the degree of heat transfer enhancement. In saturated boiling, no cavitation occurs thus the reduced thermal bubble size at departure and acoustic streaming are major factors enhancing heat transfer rate. The highest enhancement ratio is obtained in natural convection regime where no bubbles are present without ultrasonic vibration.

Copyright © 2003 by ASME

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