Nanofluids, which are mixtures of nanosize solids and liquids, show considerable promise as an efficient heat transfer medium. Our preliminary experimental studies have shown improved thermal conductivity in nanotube-in-oil suspensions. The experimental data were much higher than predicted values from the Hamilton-Crosser correlation. The experimental results were used to theoretically analyze the convective heat transfer in nanotube-in-oil suspensions. The theoretical results show that the convective heat transfer of nanotube-in-oil suspensions can be increased 30% at very low nanotube concentration (0.6 vol%).

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