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

Author(s) : KIM S. J., BANG I. C., BUONGIORNO J., et al.

Type of article: Article

Summary

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. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux.
  • Record ID : 2008-0545
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 50 - n. 19-20
  • Publication date: 2007/09

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