The Effect of two types of Winglets on Heat Transfer and Flow Structure on Inclined Triangular Cylinder

Abstract

The present work concerns the study of numerical analysis on fluid flow and heat transfer from inclined triangular cylinder with using single winglet with constant wall temperature at Reynold number rang (1 to 100).in this study used two types of winglet (curved and straight). vertical distance between the cylinder and winglet was B=(b/h) = (0.8, 0.9, 1 and 1.1) with different horizontal distance S=(s/h) = (0.01, 0.03, 0.05 and 0.07) all cases at the cylinder inclined with an angles (?=3o, 6o ,9o,12o, 15o and 18o). A FLUENT 16.1 was using to compute continuity, Navier- Stokes, and energy equations by using SIMPLIC method with appropriate boundary conditions. The results indicated there is an effect for inclination of the cylinder and using a single winglet on heat transfer from the triangular cylinder. the results show that local and overall heat transfer will be improving from inclined the cylinder and with using a single winglet (curved or straight) and the maximum heat transfer be at the angle (?=5.5). curved winglet is the best for using to enhancing heat transfer. The location of the winglet near the cylinder had a major effect on heat transfer, where maximum heat transfer be at (B=0.87, S= 0.026) for curved winglet and (B=0.9, S=0.026) for straight winglet. The overall heat transfer enhanced by (12 % - 55 %) when using single winglet with inclined cylinder compared with perpendicular cylinder to the flow and using the curved shape of winglet is the best by (10%) when compared with straight winglet.