Effect of Different Dimpled Fin Configurations and Angles on Entropy Generation, Flow Behavior, and Thermal Performance
Abstract
Recent studies highlight that flow in tubes with dimpled fins provides significant thermal performance improvement. Although the variety of these fins comes to the fore today, there is no comprehensive study on which geometry provides better performance. In this study, the heat transfer, entropy generation, and performance effects of dimpled fins with 6 different geometries and 17 different configurations, machined on a smooth tube and having the same surface area, were numerically analysed under steady-state, thermally and hydrodynamically developing flow conditions. Water has been considered as working fluid and it flowed under laminar conditions (1000≤Re≤2000). According to obtained results, the cube-shaped dimpled fins arranged as parallel to flow (CuDT/C) exhibit the highest average Nusselt number, with increases of 95.21%, 176.25%, and 272.13% for Re=1000, 1500, and 2000, respectively, compared to smoot tube. It has been determined that CuDT/C increases the performance evaluation criterion at the rates of 65.94%, 115.96%, and 176.79% for Re=1000, 1500, and 2000, respectively.
Keywords
Different dimpled fin types, Entropy generation, Laminar flow regime, Performance evaluation criterion, Thermo-hydraulic performance
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