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Measurement of Local Convective Heat Transfer Coefficient of Alumina-Water Nanofluids in a Double Tube Heat Exchanger

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Figure

Fig. 1. Schematics of the experimental setup:
Fig. 2.  Nusselt number results for experiments with distilled water and Gnielinski equation
Table 2 shows that the enhancement of the heat transfer coefficient increases with increasing the temperature
Fig. 4.  The average heat transfer coefficient of γ-Al2O3/water nanofluid as a function of the nanofluid flow rate at different nanofluid concentrations and inlet temperatures of  a) 45 °C, b) 55 °C, c) 65 °C
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