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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

EXPERIMENTAL STUDY OF POOL BOILING HEAT TRANSFER FOR NANO-PARTICLE SUSPENSIONS ON A PLATE SURFACE

Get access (open in a dialog) DOI: 10.1615/IHTC13.p28.60
7 pages

Résumé

The characteristics of boiling heat transfer of nano-fluids (nano-particle suspension) have been considerable interest in recent years for enhancing cooling capability in many high heat flux devices. In this paper an experimental investigation of pool boiling heat transfer at horizontal plate surface is firstly conducted for 26 nm Fe-water and 13nm Al2O3-water nano-particle suspensions. The experimental results show that the boiling heat transfer will be enhanced for the metal nano-particle suspension having larger thermal conductivity. The main influencing mechanisms of nano-particle suspension on pool boiling heat transfer are analysed in this work as: (1) nano-particles increase the thermal conductivity of boiling fluid, which enhances the convection heat transfer induced by the micro-layer evaporation and bubble upward motion near the boiling surface, thus enhancing boiling heat transfer (termed as a thermal effect); (2) nano-particles might cover or trap into some cavities on the boiling surface, which causes these cavities decreasing their nucleation activity or even losing their activity during the boiling, thus decreasing boiling heat transfer (termed as a surface effect). The boiling heat transfer for nano-particle suspension would finally be enhanced or deteriorated depending on the summarization of these two effects. It is concluded that the nano-particle suspension with larger thermal conductivity (such as metal particle) and having some amount of volumetric density can enhance the boiling heat transfer when the surface effect can be controlled.