Unsteady convective flow of micropolar nanofluids due to sharp protruding isothermal heaters within porous trapezoidal enclosures via LTNEM

Abstract

The current article investigates the convective transport of a micropolar nanofluid (CuO–H2O) due to a sharp protruding isothermal heater within a trapezoidal enclosure full of porous elements utilizing a local thermal non-equilibrium state (LTNEM). A low temperature condition is imposed to the titled walls of the trapezoidal while three cases of a heated mode are considered based on the perimeter of the inner triangle. With the technique of the non-orthogonal grid, the control volume method is applied to treat the governing system of equations. Simulations are performed for various ranges of the Nield number, thermal conductivity ratio, the titled angle of the side walls of the trapezoidal, the aspect ratio and the vortex viscosity parameter. The outputs revealed that when the aspect ratio is growing from 0.3 to 1, there are an enhancement in the activity of the flow by 50% is given. Also, the heat conduction mode between the nanofluid and the porous elements is supported by the raising in the ratio of thermal conductivity and Nield parameter. Furthermore, a diminishing in the heat transfer rate for the fluid phase by 12.96% is obtained when the vortex parameter is growing from 0 to 2.

Keywords

• Micropolar nanofluid
• Sharp protruding
• Trapezoidal enclosure
• Porous medium
• LTNEM