Turbulent heat transfer enhancement at the presence of different nanofluid in microchannel
عنوان دوره: 1
نویسندگان
Department of Chemical Engineering, Amirkabir Univesity of Technology (Tehran Polytechnic), Tehran, Iran
چکیده
Heat transfer enhancement and it's efficiency, has always been of interest to designers and engineers in different industries. Fluids like water, oil and ethylene glycol play an important role in cooling and heating industrial processes. The poor heat transfer properties of these fluids are a major obstacle to increasing heat transfer and more efficient heat exchangers. On the other hand, the thermal conductivity of some solids like metals, is hundreds of times greater than that of conventional energy-consuming fluids. Therefore, one of the ways to increase the heat transfer of commonly used fluids is to disperse metallic or nonmetallic particles in the base fluid, which has a higher thermal conductivity than the base fluid. In this study, the effect of adding different nanoparticles of TiO2, Al2O3, CuO and SiO2 with volume fractions of 3% and 5%, inside a tube with a circular cross-section at different Reynolds number in turbulent flow was investigated. the average Nusselt number was increased by increasing nanoparticles volume fractions. The increase in average Nusselt number is more significant in high Reynolds numbers. Among 4 investigated nanoparticles, TiO2 with a volume fraction of 3% by increasing average Nusselt number from 8.75% to 16.12% and with volume fraction of 5% by increasing 12.087% to 21.37% (in different Reynolds numbers) had the least effect on the heat transfer enhancement.
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