1. Department of Environmental Science & Engineering; State Key Laboratory of Multiphase Flow in Power Engineering; Xi'an Jiaotong University; Xi'an 710049 China
2. Department of Mechanical Engineering; National University of Singapore; Singapore 117574 Singapore
3. Jiangsu Key Laboratory of Materials and Technology for Energy Conversion; College of Materials Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 China