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Aluminum oxide (alumina) is an important material for many applications, including the manufacture of refractory and ceramic products. It is a highly hard, stiff and dielectric material. It is available in different crystalline phases, but is commonly found in the alpha phase. It is also a refractory material, which provides excellent thermal conductivity.
aluminium oxide nanofluid properties are of interest because they can be used to increase heat transfer rates, reduce viscosity, enhance rheological behavior and improve stability in a wide range of heat transfer processes. This review discusses the most recent studies on aluminium oxide nanofluids, their preparation methods, and the factors affecting the enhancement of thermal conductivity in these fluids.
Thermal conductivity measurements of water-based alumina oxide nanofluids were obtained using various techniques. A trend was observed that the thermal conductivity increased with increasing volume fraction.
Viscosity measurements were also carried out on a number of solutions at varying volume fractions. These were obtained using both a rotational viscometer and an experimental setup designed for pressure drop measurements in tubes.
Relative viscosity was measured for a range of solutions using both methods and compared to existing models in the literature. An increase in relative viscosity was observed for increasing volume fraction; however, this was negligible for lower volume fractions.
In addition to these rheological parameters, heat transfer was studied by natural convection in an annular space between horizontal cylindrical cylinders. It was found that alumina-water nanofluids could improve the heat transfer rate through the annulus. This study demonstrated that alumina-based nanofluids could be used to achieve high thermal efficiency in the process of transformer cooling.
