Numerical simulation of MHD natural convection flow in a wavy cavity filled by a hybrid Cu-Al_2O_3/water nanofluid with discrete heating

摘要

The present paper investigates the magnetic field and heat transfer inside a square cavity with a wavy upper wall. The vertical and the upper walls are kept at lower constant temperature, the third part in the middle of the bottom wall is kept on high constant temperature and the remaining part of the bottom wall are considered to be adiabatic. The unsteady laminar convection model of hybrid Cu-Al_2O_3/water nanofluid was solved numerically using finite element method for different values of considered parameters. The effect of the magnetic field parameter Ha, of the Rayleigh number Ra, of the inclination magnetic field angle γ, of the nanoparticle volume fraction Φ and of the undulation number of wave cavity n on the fluid flow, temperature and heat transfer are analysed. The important changes at the bottom wall is due to the high values in Rayleigh and Hartmann number while for the upper wall the changes come from taking different values for inclination magnetic field angle and of the undulation number of wave cavity.