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In this study, effect of dimpled/protruding fin on heat transfer performance and flow characteristics for a fin-tube heat exchanger was numerically investigated. Circular dimple/protrusion and two different dimple/protrusion aspect ratio (a/b) such as 0.667 and 1.50 in a double row arrangement were investigated in order to obtain the most feasible dimple/protrusion design parameter. The diameter of the circular dimple is 2.8 mm. The cross-sectional area of the oval dimples is equal to the cross-sectional area of the circular dimples. Simulations were carried out in the laminar flow conditions at four Reynolds (Re) numbers including 500, 1000, 1500 and 2000. Numerical calculations were performed with Ansys Fluent 19.2 using RNG k-ε turbulence model. Average Nusselt number (Nu ̅̅ ̅̅ ), lateraly-averaged Nu number distributions on the surface, thermal performance factor (TPF) and flow characteristics were comprehensively investigated. Results were compared with the flat fin surface. Numerical results revealed that dimple/protrusion fin increases heat transfer up to 26.63% compared to the flat surface. However, it was determined that the most feasible design for enhancement heat transfer is circular dimpled/protruding fin design for the fin-tube heat exchangers according to TPF results.

Kanatlı-Borulu Isı Değiştiricilerinde Çukurlu/Çıkıntılı Kanat ile Isı Transfer Performansının Arttırılması