1. The Libyan Centre for Research and Development of Saharian Communities , Mourzuq , Libya
2. Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences Heriot-Watt University , Edinburgh , EH14 4AS , UK
3. Department of Mechanical Engineering , University of Engineering & Technology Lahore Pakistan (RCET, Gujranwala) , Gujranwala , Pakistan