Experiments have been conducted to characterize the viscosity, thermal conductivity, and Nusselt number of aluminum oxide (Al2O3) nanoparticle dispersions at 6% vol. in liquid water flowing through circular tubes. Rheological characterization of the Al2O3–water nanofluid has shown that it exhibits a Newtonian fluid behavior for the shear rate range of 6 to 122 s−1 between 6 and 75°C. Measurements of the nanofluid thermal conductivity have been performed for temperatures between 6 and 55°C, and were found to be 8 to 17% higher than that of water. Heat transfer measurements for nanofluid flow in laminar thermal entry region have been conducted for three different test sections with L/D of 155, 194, and 299. The experimental results within this study indicate that the heat transfer characteristics of the Al2O3–water nanofluid flow are largely in agreement with conventional theory for single-phase flow.

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