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

被引：745

作者：

Kim, S. J.

Bang, I. C.

Buongiorno, J.

Hu, L. W.

机构：

[1] MIT, Nucl Sci & Engn Dept, Cambridge, MA 02139 USA

[2] MIT, Nucl Reactor Lab, Cambridge, MA 02139 USA

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2007年 / 50卷 / 19-20期

关键词：

nanofluids; nanoparticle deposition; critical heat flux; pool boiling; wettability; contact angle;

D O I：

10.1016/j.ijheatmasstransfer.2007.02.002

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：4105 / 4116

页数：12

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