Heat transfer of corrugated tubes mounted with semi-circular wing tapes has been experimentally investigated. TiO2-water nanofluids were employed as working fluids. Experiments were conducted in the following ranges: (i) TiO2-water nanofluids with three TiO2 concentrations (0.05 to 0.15% by volume), (ii) semi-circular wing tapes with three wing angles (45 to 75 degrees), and (iii) two wing arrangements, and (4) Reynolds numbers between 8000 and 15,000. The experiment using water as the working fluid in a corrugated tube without tape was also performed, for comparison. Evidently, the heat transfer enhancement increases with increasing wing angle. Moreover, the corrugated tubes combined with semi-circular wing tapes in parallel arrangement show better thermal performance than the ones in counter arrangement. The highest thermal enhancement factor of 1.98 is obtained by the use of the combined devices in parallel pattern at wing angle of 75 degrees, concentration of TiO2-water nanofluid of 0.15% by volume and Reynolds number of 8000.