EFFECT OF CORRUGATION FREQUENCIES ON NATURAL CONVECTIVE HEAT-TRANSFERAND FLOW CHARACTERISTICS IN A SQUARE ENCLOSURE OF VEE-CORRUGATED VERTICAL WALLS

A numerical investigation has been carried out on natural convective h eat transfer and fluid flow in a square cavity with vee-corrugated ver tical surfaces. This study covers the range of corrugation frequency f rom 1 to 3 and Grashof number from 10(3) to 10(5). The corrugation amp litude has been fixed at 5% of the enclosure height. The vorticity str eam function formulation with the control volume based finite element method has been used to analyse the effects of corrugation frequency a nd Grashof number. The investigation shows that the overall heat trans fer through the enclosure increases with the increase of corrugation f or low Grashof number; but the trend is reversed for high Grashof numb er.