Journal
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
Volume 130, Issue 4, Pages -Publisher
ASME
DOI: 10.1115/1.2818775
Keywords
nanofluids; convective heat transfer; enhancement; thermal conductivity
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The turbulent convective heat transfer behavior of alumina (Al2O3) and zirconia ON 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 (21-76 degrees C), heat fluxes (up to similar to 190 kW/m(2)), and particle concentrations (0.9-3.6 vol % and 0.2-0.9 vol % 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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