... roughness arrangement with an angle of attack of 60° shows better heat transfer performance compared to that of the 45° rib arrangement. Lau et al. [6, 7] investigated the heat transfer and friction ... ISHMT-ASME and 15th National Conference on Heat and Mass transfer conference, Jan12-14, Pune, 2000. [23] Zhang, Y. M., Gu, W. Z. and Han, J. C., “Heat transfer and friction in rectangular channels ... McMillin RD and Han J.C. Heat transfer characteristics of Turbulent flow in a square channel with angled rib. Transactions of the ASME Journal of turbo machinery 1991b; 113: 367- 374. [8] Hu Z. and Shen...