Chingtuaythong W, Chokphoemphun S. Thermal performance augmentation in heat exchanger tube with oval–pentagon rings. J. Res. Appl. Mech. Eng. [internet]. 2018 Jul. 25 [cited 2026 Apr. 21];6(1):50-62. available from: https://ph01.tci-thaijo.org/index.php/jrame/article/view/136552