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Changement de mouillabilité pendant l'ébullition libre des nanofluides et effet de celui-ci sur l'écoulement thermique critique.

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

Auteurs : KIM S. J., BANG I. C., BUONGIORNO J., et al.

Type d'article : Article

Résumé

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].

Détails

  • Titre original : Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux.
  • Identifiant de la fiche : 2008-0545
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 50 - n. 19-20
  • Date d'édition : 09/2007

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