1. Assistant Professor, Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute, Topi, Pakistan 23460.
2. Professor, Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute, Topi, Pakistan 23460 (corresponding author).
3. Professor, Dept. of Mechanical Engineering, Strathclyde Univ., Glasgow, U.K. G1 1XQ.
4. Senior Lecturer, Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute, Topi, Pakistan 23460.
5. Teaching Fellow, Dept. of Mechanical Engineering, Strathclyde Univ., Glasgow, U.K. G1 1XQ.