1. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa
2. Department of Chemical and Metallurgical Engineering, University of the Witwatersrand, 1 Jorissen Street, Johannesburg 2000, South Africa
3. Department of Chemical Engineering, Stellenbosch University, Western Cape 7600, South Africa