Computational Analysis of Dimples Surface Tube on Heat Transfer Forced Convection Using Turbulence Model of Low Reynolds Number with Different Cases

The researchers aimed to improve the heat transfer process using various industrial engineering techniques to highlight the importance of maximum heat transfer and improvement. In the current numerical study, the Ansys Fluent R23 program was used to enhance the heat transfer rate with a laminar flow in the Reynolds number range of (500-1500) steady state single-phase inside a dimpled tube with three different states heated with a uniform constant heat flux (8000 W/m2) along the flow axis. The effect of the dimples' arrangement on the tube's surface was studied to compare the thermal performance against the empty tube. Comparing the three cases (1, 2, and 3) to the standard tube without a dimple, the heat transfer rates increased by (86.99, 87.22, and 87.47%), respectively. Compared to tubes with two or three dimples, the heat exchanger tube with four dimples on its cross section and linearly towards the flow axis performs much better in terms of thermal-hydraulic performance.