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Study of the enhanced thermal conductivity of Fe nanofluids

Tae-Keun HongDepartment of Physics, Pusan National University , Pusan 609-735, KoreaHo‐Soon YangDepartment of Physics, Pusan National University , Pusan 609-735, KoreaC.J. ChoiKorea Institute of Machinery and Materials , 66 Sangnam-Dong, Changwon, Kyungnam 641-010, Korea

2005en

ABI

Annotatsiya

Nanofluids, a mixture of nanoparticles and fluid, have enormous potential to improve the efficiency of heat transfer fluids. Fe nanofluids are prepared with ethylene glycol and Fe nanocrystalline powder synthesized by a chemical vapor condensation process. Sonication with high-powered pulses is used to improve the dispersion of nanoparticles in the preparation of nanofluids. Nanofluids exhibit an enhancement of thermal conductivity after sonication. Thermal conductivity of a Fe nanofluid is increased nonlinearly up to 18% as the volume fraction of particles is increased up to 0.55 vol. %. Comparing Fe nanofluids with Cu nanofluids, we find that the suspension of highly thermally conductive materials is not always effective to improve thermal transport property of nanofluids.

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DOI: 10.1063/1.1861145

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