1. Department of Mechanical Engineering, Fukui University, 9-1, Bunkyo 3-chome, Fukui, 910-8507, Japan
2. Department of Chemical Engng Machinery, Tianjin University, Tianjin, 300072, P. R. China
3. Department of Mechanical Engineering, Ritsumeikan University, 1-1-1, Noji-higashi, Kusatsu-shi Shiga, 525-8577, Japan