1. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
2. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332;
3. School of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
4. Fellow ASME George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 e-mail: