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Journal of Enhanced Heat Transfer

Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

Institutional price:	$577.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2007, Volume14

83 pages

DOI: 10.1615/JEnhHeatTransf.v14.i3

Issue price - $160.00

Study on Pool Boiling Heat Transfer of Nano-Particle Suspensions on Plate Surface

M. H. Shi
Department of Power Engineering, Southeast University, Nanjing, 210096, China

M. Q. Shuai
Southeast University, Nanjing, China

Z. Q. Chen
Southeast University, Nanjing, China

Qiang Li
Nanjing University of Science & Technology, Nanjing, China

YiMin Xuan
School of Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China

ABSTRACT

The characteristics of boiling heat transfer of nanofluids (nano-particle suspension) have been considerable of 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 13 nm, 28 nm 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 mechanisms of nano-particle suspension on pool boiling heat transfer are analyzed 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 fluid 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 particles) and having some amount of volumetric density can enhance the boiling heat transfer when the surface effect can be controlled.