Affiliation: | a Department of Mechanical Engineering, Pretoria Campus, Tshwane University of Technology, Private Bag X680, 0001 Pretoria, South Africa b School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia c School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia |