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Experimental investigation of nanofluid shear and longitudinal viscosities

Appl. Phys. Lett. 92, 244107 (2008); doi:10.1063/1.2945799

Published 20 June 2008

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Aaron J. Schmidt,1 Matteo Chiesa,1 Darius H. Torchinsky,2 Jeremy A. Johnson,3 Avid Boustani,1 Gareth H. McKinley,1 Keith A. Nelson,3 and Gang Chen1
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2Department of Physics Massachusetts, Institute of Technology, Cambridge, Massachusetts 02139, USA
3Department of Chemistry Massachusetts, Institute of Technology, Cambridge, Massachusetts 02139, USA

Dilute nanoparticle suspensions of alumina in decane and isoparaffinic polyalphaolefin (PAO) exhibit thermal conductivity and shear viscosity that are enhanced compared to continuum models that assume well-dispersed particles. An optical technique has been used to measure the longitudinal viscosity of these suspensions at frequencies from 200  to  600  MHz and evaluate an effective hydrodynamic particle size. The measurements indicate that for the decane-based nanofluids the nanoparticles do not form clusters. In the case of PAO nanofluids, the measurements of longitudinal viscosity and the corresponding values of the particle size are consistent with a picture of nonclustered particles in a weakly shear-thinning viscous oligomeric oil. ©2008 American Institute of Physics
History: Received 25 February 2008; accepted 28 May 2008; published 20 June 2008
Permalink: http://link.aip.org/link/?APPLAB/92/244107/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.70.Kj
    Emulsions and suspensions
  • 66.20.Gd
    Diffusive momentum transport in liquids
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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