1. Dept. of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical Univ., Athens 15780, Greece; presently, Clean Combustion Research Center, King Abdullah Univ. of Science and Technology, Thuwal, Jeddah 23955-6900, Kingdom of Saudi Arabia.
2. Professor, Dept. of Mechanical Engineering, Khalifa Univ. of Science and Technology, Abu Dhabi 127788, United Arab Emirates.
3. Professor, Dept. of Mechanical Engineering, Khalifa Univ. of Science and Technology, Abu Dhabi 127788, United Arab Emirates; Dept. of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical Univ., Athens 15780, Greece (corresponding author).