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Surface Deposition of Nanoparticles During Pool Boiling of Nanofluids and Its Effects on CHF Enhancement Using Nanofluids

[+] Author Affiliations
Hyung Dae Kim, Moo Hwan Kim

Pohang University of Science and Technology, Pohang, South Korea

Paper No. ICNMM2007-30071, pp. 783-788; 6 pages
doi:10.1115/ICNMM2007-30071
From:
  • ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 5th International Conference on Nanochannels, Microchannels, and Minichannels
  • Puebla, Mexico, June 18–20, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4272-X | eISBN: 0-7918-3800-5
  • Copyright © 2007 by ASME

abstract

This paper is concerned about mechanism of outstanding CHF enhancement phenomena using nanofluids, a subject with academically and industrially remarkable interest. Pool boiling experiments using an electrically heated horizontal wire were carried out with various water-based nanofluids containing Ag, Al2 O3 , SiO2 , and TiO2 nanoparticles. The results showed that nanoparticle deposition on the heater surface occurred during pool boiling of nanofluids, and that the effect of nanoparticle porous layer on CHF could explain enough the CHF enhancement of nanofluids. Then the porous surface was characterized using surface wettability and capillary wicking performance, which are the significant properties of boiling surface influencing CHF. Discussion of the results suggested that the outstandingly enhanced CHF performances of nanofluids under the nucleate pool boiling were associated with enhanced surface wettability and liquid suction effect due to capillary wicking on the nanoparticle-deposited surface.

Copyright © 2007 by ASME

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