Sunu, P. W., Anakottapary, D. S., Suarta, I. M., Santosa, I. D. M. C. and Suarsana, K. (2020) “HEAT TRANSFER ENHANCEMENT AND FRICTION IN DOUBLE PIPE HEAT EXCHANGER WITH VARIOUS NUMBER OF LONGITUDINAL GROOVES”, Acta Polytechnica, 60(6), pp. 518–527. doi: 10.14311/AP.2020.60.0518.