Mixed convection of a low Prandtl fluid with spatially periodic lower wall heating in the presence of a wall-normal magnetic field

摘要: Abstract Numerical simulations of the combined natural and forced convection flow in a horizontal channel have been carried out for fluid low Prandtl number presence uniform wall-normal magnetic field. The upper wall is maintained at constant temperature, while spatially periodic temperature imposed lower wall. A stability diagram created based on results from two- three-dimensional numerical order to examine whether present two-dimensional flows are unstable disturbances. At range parameters studied ( 5000 ⩽ Ra 150 , 000 -Rayleigh number, 5 Re 500 -Reynolds 0 Ha 20 -Hartmann number), no stable unsteady observed. All mixed suppressed by action sufficiently strong electromagnetic forces and, contrast hydrodynamic cases, direct transition unsteadiness favored with an apparent lack steady magnetohydrodynamic flows. velocity features various regimes discussed, addressing also differences predictions produced simulations.