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Research Papers: Micro/Nanoscale Heat Transfer

The Effect of Local Thermal Nonequilibrium on the Onset of Convection in a Nanofluid

[+] Author and Article Information
D. A. Nield

Department of Engineering Science, University of Auckland, Private Bag 92019, Auckland 1142, New Zealandd.nield@auckland.ac.nz

A. V. Kuznetsov

Department of Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Raleigh, NC 27695-7910avkuznet@eos.ncsu.edu

J. Heat Transfer 132(5), 052405 (Mar 09, 2010) (7 pages) doi:10.1115/1.4000474 History: Received July 21, 2009; Revised September 23, 2009; Published March 09, 2010; Online March 09, 2010

The onset of convection in a horizontal layer of a nanofluid is studied analytically. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis, and allows for local thermal nonequilibrium (LTNE) between the particle and fluid phases. The analysis reveals that in some circumstances, the effect of LTNE can be significant, but for a typical dilute nanofluid (with large Lewis number and with small particle-to-fluid heat capacity ratio), the effect is small.

Copyright © 2010 by American Society of Mechanical Engineers
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