Impact of heated obstacle position on magneto-hybrid nanofluid flow in a lid-driven porous cavity with Cattaneo-Christov heat flux pattern

This article mainly emphases on the study of magneto Cu-Al2O3/water hybrid nanofluid flow in a non-Darcy porous square cavity. The square geometry is a lid-driven enclosure with an inside heated square obstacle. Cattaneo-Christov heat flux pattern is used for the formulation of the heat equation. This type of problems may be applicable in the high temperatures in the different scientific processes, extrusion of polymers, aerodynamics extrusion and cooling hot glass. Dimensionless forms of governing flow expressions are computed numerically with Finite Volume Method via SIMPLER algorithm simultaneously. The characteristics of numerous dimensionless parameters such as; Richardson number (0.1 <= Ri <= 100), Hartmann number (0 <= Ha <= 100), height of hot square obstacle (0.1 <= H <= 0.5), width of hot square obstacle (0.1 <= W <= 0.5), Reynolds num ber (0.1 <= Re <= 25) and Darcy number (10(-2) <= Da <= 10(-6)) are analyzed. The achieved results are projected graphically via streamlines, isotherms, local and average Nusselt numbers. The fluid flow and rate of heat transfer in the direction of the moving heated obstacle isfound to play an important role. The higher values of Ha decreases the local Nusselt number. Hybrid nanofluid provides a higher heat transfer rate than the nanofluids. Increasing the width of the obstacle cause to decline in the thickness of the right wall, this enhances the heat transfer in the clockwise direction. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of Faculty of Engineering, Alexandria University.

Automated summary

This article focuses on the study of magneto Cu-Al2O3/water hybrid nanofluid flow in a non-Darcy porous square cavity, analyzing the influence of various dimensionless parameters on the flow. Results show that the rate of fluid flow and heat transfer in the direction of the moving heated obstacle play a crucial role in the process.