The empirical correlation for forced convection heat transfer of homogeneous hybrid nanofluid TiO‎۲/Al۲O۳ in a non-uniform heat flux test section

In this research, an empirical correlation is derived to determine the Nusselt number for nanofluid forced convection flow in a vertical annulus with non-uniform heat flux. The experiments investigate the heat transfer of a homogeneous combined nanofluid composed of TiO۲ and Al۲O۳ dispersed in water. Compared to other conventional fluids, nanofluids exhibit better heat transfer performance due to higher conductivity and reducing the thermal boundary layer. Nanofluids have the potential to function in an emergency core cooling system. A ۲۵-bar test loop with a vertical test section generating non-uniform heat flux is used for the experiment. The tests are conducted at multiple Reynolds numbers and volumetric concentrations of the nanofluid. A new correlation for nanofluid heat performance is developed based on dimensional analysis and multiple linear regression analysis. The Nusselt number derived from the developed correlation shows high accuracy, with R۲ = ۰.۹۲, indicating better performance compared to existing correlations.

کلیدواژه ها:

hybrid nanofluid ، Al۲O۳-TiO۲ ، empirical correlation ، Forced Convection