1. Laboratory of Thermal and Environment, Advanced Teacher’s Training College for Technical Education, University of Douala-Cameroon, Douala P.O. Box 1872, Cameroon
2. Department of Mechanical Engineering, University of West Attica, Campus II, Thivon 250, 12244 Aegaleo, Athens, Greece
3. Laboratory of Technology and Applied Sciences, University Institute of Technology, University of Douala, Douala P.O. Box 8698, Cameroon
4. Laboratory of Transport and Applied Logistics, University Institute of Technology, University of Douala, Douala P.O. Box 8698, Cameroon