Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux
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- Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux
- Kim, S. J.; Bang, In Cheol; Buongiorno, J.; Hu, L. W.
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.50, no.19-20, pp.4105 - 4116
- 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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