Numerical Investigation of Ribs Number Effect on Heat Transfer Inside A Heated Duct

Abstract

Numerical simulations of flow and heat transfer are conducted in a three-dimensional square duct, including circular ribs positioned at the mid-height. The properties of the rib are examined, including the rib count (1-2-5-7) and the placement angle (0, 30, 45 degrees).  Reynolds number is set as constant at 5000 for all studied cases. The existence of these ribs significantly influences heat transfer. The heat transfer rate is directly related to the quantity of ribs and positioning angle. The maximum recorded enhancement in Nusselt number is 30%.