1. School of Mechanical Engineering, University of Ulsan, Daehak-ro 93, Namgu, Ulsan 680-749, Republic of Korea
2. Department of Mechanical Engineering, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
3. School of Energy Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India