Effect of Wall Waviness on Heat Transfer by Natural Convection in A Horizontal Wavy Enclosure

The present paper reports a numerical investigation of natural convection and fluid flow in a horizontal wavy enclosed. Its bottom wall is varied with a sinusoidal function while the top and the two side walls are flat. The wavy wall has constant hot temperature and ceiling is cold as verticals are symmetrical. Unsteady governing equations are discretised using the control volume based finite-volume method with collocated variable arrangement. Results are presented in the form of local and global Nusselt number distribution, streamlines, and isotherms lines for different values of aspect ratio and Rayleigh number. The numerical results show that the flow and the heat transfer are strongly affected by the amplitude of the sinusoidal profile.