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Contradictory Evidence for the Role of Temperature and Particle Size in Nanofluid Thermal Conductivity

Published online by Cambridge University Press:  24 November 2011

Rebecca J. Christianson  and
Jessica Townsend
Rebecca J. Christianson
Affiliation:
Franklin W. Olin College of Engineering, Olin Way, Needham, MA 02492, U.S.A.
Jessica Townsend
Affiliation:
Franklin W. Olin College of Engineering, Olin Way, Needham, MA 02492, U.S.A.
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Abstract

The prospects for increased cooling capacity from the use of nanofluid coolants has created a tremendous amount of interest. However, in the years since the initial thermal conductivity measurements of nanoparticle suspensions were reported, there has been much inconsistency in data published in the literature. The International Nanofluids Benchmarking Exercise was a significant step towards creating a reliable set of data on the thermal conductivity enhancement of stable nanofluids, however there remain many unanswered questions. Most significant, perhaps, is the contradictory results on the effects of particle size and temperature. In the past year alone it is possible to find published reports on nominally identical samples claiming precisely opposing trends in thermal conductivity with decreasing particle size at room temperature. Some studies also claim an increasing enhancement at higher temperatures, sometimes linking this to small particle sizes. In this work we review the literature claims for particle size and temperature results, the theories used to support those claims, as well as presenting new data with the aim of resolving the dispute and identifying the origins of the evidence for contradictory claims.

Keywords

thermal conductivitycolloidfluid
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1347: Symposium BB – Nanoscale Heat Transport—From Fundamentals to Devices , 2011 , mrss11-1347-bb04-01
Copyright
Copyright © Materials Research Society 2011

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