The friction and heat transfer tests of 16 different structural parameter (e/d= 0.022-0.058; t/e=9.09-36.36) of transversally corrugated tubes were made with water as working medium

Reynolds number 5000-50000. The fluid flow patterns were observed by using several transparent models of hydrogen bubble flow tracers. The general correlations for friction factor and Stanton number were obtained with a semi-theoretical and semi-statistical method. Prediction of Fanning friction factor and Stanton number were given with the errors within ±12% as compared with experimental data.A transversally corrugated tube of optimal structural parameters was obtained under certain operation condition. The heat transfer performance of transversally corrugated tube was superior to the spiral grooved tube recommended by previous studies.