1. Fluid Machinery Technology
and Research Centre, Daejoo Machinery Co. Ltd., 1028 Wolam-dong, Dalseo, Daegu 704-833, South Koreae-mail:
2. Professor Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600-036, Tamil Nadu, India e-mail:
3. Professor School of Mechanical Engineering, Andong National University, 388 Songchun-Dong, Andong, Gyeongbuk 760-749, South Koreae-mail: