EFFECTS OF RECTANGULAR-SHAPED TURBULATORS ON HEAT TRANSFER, FRICTION FACTORS, AND ENTROPY

Authors : İlker Fırat

Pages : 903-922

Doi:10.17482/uumfd.1676540

View : 84 | Download : 157

Publication Date : 2025-12-19

Article Type : Research Paper

Abstract :In this study, the effects of turbulators with different P ratios placed in a circular cross-section test pipe under turbulent flow conditions using water as the working fluid on heat transfer, friction factor (f), and entropy production were investigated using Ansys-Fluent 2021. The lowest Nu was calculated as 111 at Re=11825 for P=6, while the highest Nu was calculated as 219 at Re=19133 for P=1. The increase in Nu values for P = 6, 3, 2, 1.5, 1.2, and 1 compared to the plain pipe is 10.34%-11.64%; 17.39%-18.78%; 25.31%-26.56%; 34.42%-35.88%; 43.53%-44.87%; and 50.36%-51.47%, respectively. In turbulent situations, the highest entropy production rate was found to be 0.3631 W/mK at Re=11825 for P=6, while the lowest entropy production rate was found to be 0.2215 W/mK at Re=19133 for P=1. The minimum and maximum Ns reduction compared to the empty pipe was calculated as 7.13% for Re=19133 at P=6 and 46.62% for Re=11825 at P=1, respectively. In turbulent conditions, the highest Bejan number was found to be 0.9931 at Re=11825 for P=6. As a result, it was concluded that a ratio of P=1 provides maximum benefit in terms of heat transfer, while a ratio of P=6 is ideal in terms of total entropy production.
Keywords : Entropi, Isı transferi, Sürtünme faktörü, Türbülatör, Reynolds sayısı

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