1. Sana'a University Department of Mechanical Engineering, Faculty of Engineering, , Sana'a1 2544 , Yemen
2. King Abdulaziz University Department of Mechanical Engineering, Faculty of Eng.-Rabigh, , P. O. Box 344, Rabigh 21911 , Saudi Arabia
3. Assiut University Department of Mechanical, Design and Production Engineering, , Assiut 71516 , Egypt
4. Assiut University Department of Mechanical, Design and Production Engineering, Faculty of Engineering, , Assiut 71516 , Egypt