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Research Papers: Micro/Nanoscale Heat Transfer

Experimental Investigation of Turbulent Convective Heat Transfer and Pressure Loss of Alumina/Water and Zirconia/Water Nanoparticle Colloids (Nanofluids) in Horizontal Tubes

[+] Author and Article Information
Wesley Williams, Jacopo Buongiorno

Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

Lin-Wen Hu

Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Heat Transfer 130(4), 042412 (Mar 21, 2008) (7 pages) doi:10.1115/1.2818775 History: Received March 23, 2007; Revised May 30, 2007; Published March 21, 2008

The turbulent convective heat transfer behavior of alumina (Al2O3) and zirconia (ZrO2) nanoparticle dispersions in water is investigated experimentally in a flow loop with a horizontal tube test section at various flow rates (9000<Re<63,000), temperatures (2176°C), heat fluxes (up to 190kWm2), and particle concentrations (0.93.6vol% and 0.20.9vol% for Al2O3 and ZrO2, respectively). The experimental data are compared to predictions made using the traditional single-phase convective heat transfer and viscous pressure loss correlations for fully developed turbulent flow, Dittus–Boelter, and Blasius/MacAdams, respectively. It is shown that if the measured temperature- and loading-dependent thermal conductivities and viscosities of the nanofluids are used in calculating the Reynolds, Prandtl, and Nusselt numbers, the existing correlations accurately reproduce the convective heat transfer and viscous pressure loss behavior in tubes. Therefore, no abnormal heat transfer enhancement was observed in this study.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Loading-dependent thermal conductivity

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Figure 9

Viscous pressure losses for water tests

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Figure 11

Viscous pressure losses for zirconia nanofluid tests

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Viscosity of alumina nanofluids

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Figure 2

Temperature-dependent thermal conductivity

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Figure 4

Viscosity of zirconia nanofluids

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Figure 5

Schematic of convective loop experimental facility

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Figure 6

Tube averaged Nusselt number for water tests

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Figure 7

Tube averaged Nusselt number for alumina nanofluid tests

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Figure 8

Tube averaged Nusselt number for zirconia nanofluid tests

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Figure 10

Viscous pressure losses for alumina nanofluid tests

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