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Nanofluids Containing γ-Fe2O3 Nanoparticles and Their Heat Transfer Enhancements

Author(s): Guo Shou-Zhu | Li Yang | Jiang Ji-Sen | Xie Hua-Qing

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 7;
Start page: 1222;
Date: 2010;
Original page

Keywords: γ-Fe2O3 nanoparticle | Magnetic nanofluid | Thermal conductivity | Viscosity | Heat transfer coefficient

Abstract Homogeneous and stable magnetic nanofluids containing γ-Fe2O3 nanoparticles were prepared using a two-step method, and their thermal transport properties were investigated. Thermal conductivities of the nanofluids were measured to be higher than that of base fluid, and the enhanced values increase with the volume fraction of the nanoparticles. Viscosity measurements showed that the nanofluids demonstrated Newtonian behavior and the viscosity of the nanofluids depended strongly on the tested temperatures and the nanoparticles loadings. Convective heat transfer coefficients tested in a laminar flow showed that the coefficients increased with the augment of Reynolds number and the volume fraction.

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