Flow field and heat transfer in a channel with a permeable wall filled with Al2O3-Cu/water micropolar hybrid nanofluid, effects of chemical reaction and magnetic field

Abstract

In this study, the flow field and heat transfer of Al2O3-Cu/water micropolar hybrid nanofluid is investigated in a permeable channel using the least square method. The channel encounters a chemical reaction, and a constant magnetic field also is applied. The bottom wall is hot, and coolant fluid is injected into the channel from the top wall. The effects of different parameters, such as the Reynolds number, the Hartmann number, the microrotation factor, and the concentration of nanoparticles, on the flow field and the heat transfer are examined. The results show that an increase in the Hartmann number and the Reynolds number, in turn, will increase the Nusselt and Sherwood numbers. Furthermore, when hybrid nanofluid, rather than pure nanofluid, is applied, the heat-transfer coefficient will increase significantly. It also is observed that, in the case of a generative chemical reaction, the fluid concentration is more than in the case of a destructive chemical reaction. Moreover, when the micropolar model is used, the Nusselt number and Sherwood number are less than when it is not considered.