Numerical Study of Thermal-Hydraulic Performance of Forced Convection Heat Transfer in Dimple Surface Pipe with Different Shapes using Commercial CFD Code

Abstract

Various technologies have been used, including a regular tube with the inclusion of dimples, which are widely used to enhance the thermo-hydraulic performance of engineering applications. A numerical analysis involving this work of the thermo-hydraulic performance of water flow in a scarred pipe. By numerical solution using the Ansys Fluent 2023 R2 program to model the flow through the pipe, the effect of different dimple shapes (square, circular, and triangle) has been studied. The finite volume method identified a new enhancement model that makes use of composite-form surface techniques. To assess the effect of scarring on the field of velocity and turbulent flow, the continuity, momentum, and heat energy equation represented by the three-dimensional governing differential equations was studied using the k-epsilon flow model for the Reynolds number range of (3500-7000). The numerical results indicated the dimple surface of the pipe significantly improves the heat transfer rate and also increases the friction factor compared to the smooth pipe without dimple. Percentage (12.808, 17.987, and 20.978%) of the increase in heat transfer rate enhancement (Nusselt number) for the three dimple shapes of the pipe (square, circular, and Triangle) respectively, moreover dimpled pipe has a higher coefficient of friction compared to the normal pipe.