Publikacje

Abstract:

The application of nanofluids in heat exchangers has established to be beneficial in augmenting heat transfer performance. In this work, we present an experimental study to find out the performance of a heat exchanger tube using water/alumina-silica nanofluid subjected to constant heat flux condition. Well stabilized nanofluid was applied as a working fluid at different concentrations ranging from 0.01-0.025 vol. %. Average Nusselt numbers (Nuavg) and friction factor (f) were determined by varying Reynolds number (Re) from 6000-24000. Effects of changing Re and concentration on Nuavg and f were analyzed. The addition of nanoparticles led to rise in Nuavg and f. Maximum average increments of 13.57 % in Nuavg and 10.08 % in f were obtained for hybrid nanofluid with 0.025 vol. % as compared to water when Re = 24000. Sensitivity analysis describes that Nuavg and f are more sensitive to concentration than Re. Various figures of merits determined the thermal performance of the heated tube. New correlations of high accuracies (R2 > 99 %) for Nuavg and f are proposed. Finally, hybrid nanofluids are recommended for heat transfer application with the caution of pumping power enhancement.

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Enhancing cooling performance of a heat exchanger driven by water/alumina-silica hybrid nanofluid: experimental results