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Bang, In Cheol
Nuclear Thermal-Hydraulics & Reactor Safety Lab
Research Interests
  • Nuclear Thermal-Hydraulics
  • Nuclear Safety
  • Nuclear System Design & Analysis
  • Nanofluids
  • Critical Heat Flux

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Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux

Cited 254 times inthomson ciCited 273 times inthomson ci
Title
Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux
Author
Kim, S. J.Bang, In CheolBuongiorno, J.Hu, L. W.
Keywords
Contact angle; Critical heat flux; Nanofluids; Nanoparticle deposition; Pool boiling; Wettability
Issue Date
2007-09
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.50, no.19-20, pp.4105 - 4116
Abstract
The pool boiling characteristics of dilute dispersions of alumina, zirconia and silica nanoparticles in water were studied. Consistently with other nanofluid studies, it was found that a significant enhancement in critical heat flux (CHF) can be achieved at modest nanoparticle concentrations (<0.1% by volume). Buildup of a porous layer of nanoparticles on the heater surface occurred during nucleate boiling. This layer significantly improves the surface wettability, as shown by a reduction of the static contact angle on the nanofluid-boiled surfaces compared with the pure-water-boiled surfaces. A review of the prevalent CHF theories has established the nexus between CHF enhancement and surface wettability changes caused by nanoparticle deposition. This represents a first important step towards identification of a plausible mechanism for boiling CHF enhancement in nanofluids.
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DOI
10.1016/j.ijheatmasstransfer.2007.02.002
ISSN
0017-9310
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