Pazarlioglu, H.K.Ekiciler, R.2024-09-292024-09-2920241064-2285https://doi.org/10.1615/HeatTransRes.2023048288https://hdl.handle.net/20.500.14619/9136Numerous scientists have examined circular dimpled surfaces, tubes, and other approaches for enhancing heat transfer. Moreover, the dimples’ angle of attack has a substantial effect on the tube’s flow and thermal features. This numerical study presents a novel approach to enhancing heat transfer rate in a tube subjected to constant heat flux by incorporating a surface dimpling strategy and evaluates three different tube layouts with elliptical dimpled fins for different working fluids such as DW and Al2O3/DW nanofluid (? = 0.5–1.0%) by using ANSYS Fluent v2020R2 under laminar flow conditions. Under identical circumstances, the thermal performances of proposed designs are compared to those of a smooth tube, and the influence of the elliptical dimpled fin angle of attack on these parameters is determined for different Reynolds numbers (1000 ? Re ? 2000). When comparing the Nusselt number of a tube with/without elliptical dimpled fins, it is found that EDT 1 performed better. Lower Reynolds numbers are shown to result in a greater friction factor. Besides, elliptical dimpled fins promote flow mixing within the tube and the establishment of a thermal boundary layer. At a 135° attack angle (EDT 1), the 1.0% Al2O3/DW nanofluid is found to be the best-performing nanofluid in the dimpled tube, improving Nu by up to 44.56%. Furthermore, ff presented an increase of 29.18% when comparing ST and EDT 1 flowing 1.0% Al2O3/DW at Re = 2000, while total S•gen is diminished by 37.75% in the same conditions. © 2024 by Begell House, Inc.eninfo:eu-repo/semantics/closedAccessAl₂O₃/DWCFDelliptical dimpled finentropy generationnanofluidsudden expansion tubeArticle10.1615/HeatTransRes.20230482882-s2.0-85181769447671Q34955