1. Laboratory for Turbomachinery and Components, Department of Biomedical Engineering and Mechanics, Virginia Tech, Norris Hall, Room 342, 495 Old Turner Street, Blacksburg, VA 24061 e-mail:
2. Laboratory for Turbomachinery and Components, Department of Biomedical Engineering and Mechanics, Virginia Tech, Norris Hall, Room 107, 495 Old Turner Street, Blacksburg, VA 24061 e-mail: