1. Mechanical Engineering Department, Tafila Technical University, 66110 Tafila, Jordan
2. Institut für Strömungsmechanik, Technische Universität Braunschweig, Hermann-Blenk-Straße 37, D-38108 Braunschweig, Germany
3. School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Room 312, Building C, University Town, Xili, Shenzhen 518058, People's Republic of China