The Effect of Different Corrugated on the rate of Natural Convection Heat Transfer inside a Square Cavity

Natural convection of a two-dimensional laminar incompressible fluid flow in a square cavity with different corrugated on the bottom wall has been investigated by finite element method in Comsol software. The top and the bottom walls are insulated, the left and the right walls are maintained at a constant temperature Tc (TH> Tc). In this study, cavites with different corrugated by shapes of rectangular, trapezoidal, triangular and sinusoidal are studied for different amplitude of shapes of blocks, periodicity amplitude and aspect ratio and Rayleigh number. The air is chosen as a working fluid. Hydrodynamic and thermal behavior of fluid is analyzed in form of streamlines, isotherms and the average Nusselt number. Results based on this numerical study showed that the by increasing the Rayleigh number the rate of Nusselt number increases. There is an optimized range for increment rate of heat transfer by increasing the amplitude of shapes of blocks and periodicity amplitude. Also the maximum rate of heat transfer occurs in sinusoidal shape of cavity.