Wentao Ji
Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi'an Jiaotong University, 28 Xian Ning West Road, Xi'an 710049, China
Ding-Cai Zhang
Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Chuang-Yao Zhao
Key Laboratory of Thermo-Fluid Science and Engineering, MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, People's Republic of China
Zeng-Yao Li
Key Laboratory of Thermo-Fluid and Science and Engineering, Ministry of Education School of Energy and Power Engineering, Xi'an Jiaotong University No. 28 West Xianning Road, Xi'an, Shaanxi, 710049, China
Ya-Ling He
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
Wen-Quan Tao
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, China; International Joint Research Laboratory of Thermal Engineering, Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power
Engineering, Xi'an Jiaotong University, Xi'an 710049, China
An experimental investigation on heat transfer performance of enhanced tubes is conducted with refrigerant R134a. The heat flux is from 10,000 to 370,000 W/m2.The heat transfer is substantially enhanced at the heat flux less than 200 kWm2. An increase of heat transfer coefficient up to 330% above the plain tube is observed. However, at the heat flux higher than 200 kWm2, it is found that the heat transfer coefficient of enhanced tubes is even lower than the plain tube. The same features are also observed for other enhanced tubes in the literatures.