1. Department of Petroleum and Chemical Engineering, Sultan Qaboos University, P.O. Box 33, Muscat, Oman
2. Department of Mechanical Engineering, Sultan Qaboos University, P.O. Box 33, Muscat, Oman
3. Chemical and Biochemical Engineering Department, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
4. Mining and Nuclear Engineering Department, Missouri University of Science and Technology, Rolla, Missouri 65409, United States