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The aim of this paper is to examine the influence of wave amplitude and wave number on the thermal-flow behavior of sinusoidal wavy finned-tube heat exchangers. Thirteen geometries with various wave amplitudes (0.75–2.5 mm) and wavenumbers (2–6 waves) are analyzed for Reynolds numbers varying from 800 to 2700. The inspection revealed that the thermal exchange rate, the Colburn factor, and the friction factor increase with wave amplitude ( A ) and the number of waves ( Nw ), while the fin efficiency decrease for all  Re . For  Re  varying from 1066 to 2700, the wavy fins with  A  = 1.75 mm and  Nw  = 4 provide the most outstanding values of the performance evaluation criterion (PEC). However, at  Re  = 800, the PEC ratios decrease with augmented  A  and  Nw . Regarding the global performance criterion, the wavy fins with the lowest amplitude values ( A  = 0.75 mm) and the number of waves ( Nw  = 2) reached the highest  Gpc  values at all Reynolds numbers.

Investigation of the thermal-flow performances of sinusoidal wavy finned-tube heat exchangers