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Department of Chemical & Process Engineering

University of Moratuwa



B.Sc. Eng.(Moratuwa), Ph.D.(Cambridge)


Professor of the Department

 Contact Details 

E - Mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone:  +94 112 650301       Ext :4103 
Direct:   +94 112 650 281 

Fields of Interest

Process Industry - Developing environmentally friendly technologies for Sri Lanka, Appropriate technologies 
Energy Efficiency and Conservation techniques for Process Industries, Renewable Energy Systems
Process modifications and optimisation techniques to maximize yields and resource usage.
Solid Waste Management and Waste to Energy Systems
Food processing systems

Researches and publications 

Journal Publications 

de Alwis, AAP; Halden, K and Fryer, PJ. ‘Shape and conductivity effects in the ohmic heating of foods', Chem.Eng.Res.Des., 67, 159-168, 1989

Halden, K; de Alwis, AAP and Fryer, PJ ‘Changes in electrical conductivity of foods during ohmic heating', Int.J Fd.Sci. Technol., 25, 9-25, 1990. 

de Alwis, AAP and Fryer, PJ ‘The use of network theory in the finite element analysis of coupled thermo-electric fields', Commun.Appl.Num method, 6, 61- 66, 1990. 

de Alwis, AAP and Fryer, PJ ‘A finite element analysis of heat generation and transfer during ohmic heating of food', 45, 6, 1547-1559, Chem.Eng.Sci. 1990. 

de Alwis AAP and Fryer PJ ‘The use of direct resistance heating techniques in the food industry', 11, 1, 3-27, J.Food.Eng. 1990. 

de Alwis AAP and Fryer PJ. ‘Operability of the ohmic heating process: Electrical conductivity effects', 15, 1, 21-48,J. Food Eng. 1992. 

Fryer, PJ, de Alwis AAP, Koury, E, Stapeley AGF and Zhang Li, ‘Ohmic heating of solid -liquid foods: Heat generation and convection effects', 18, 101-125, J of Food Eng., 1992. 

Liu S., Pain J-P, Proctor J, de Alwis AAP and Fryer PJ, ‘An experimental study of particle flow velocities in solid-liquid food mixtures’, Chemical Engineering Communications, Vol. 124, 97-114, 1993. 

Samaranayake CP, Bamunuarachchi A, and de Alwis AAP, Peroxide formation in Ohmic heating of meats, Ceylon Journal of Physical Sciences, 3(1), 30-35, 1996. 

Edirisinghe EMRKB, Bamunuarachchi A. and de Alwis AAP, Study of some physical changes in selected foods during ohmic heating’, Ceylon Journal of Sciences: Physical Sciences 4(1), 61-72, 1997. 

Jayawardhana LC, Manipura A, Ranasinghe M, Pilapitiya S., de Alwis AAP and Abeygunawardena I, Development of an Expert system for better management of solid waste composting for pradeshiya sabhas in Sri Lanka, Engineer Transactions 2001, 138-146, 2001 

de Alwis AAP, Biogas – A review of Sri Lanka’s performance with a renewable energy technology, Energy for Sustainable Development, 6(1), 30-37, 2002. 

Jayawardhana LC, Manipura A, Ranasinghe M, Pilapitiya S., de Alwis AAP and Abeygunawardena I, BESTCOMP: Expert system for Sri Lankan solid waste composting, J of Expert Systems with Applications, Elsevier (in press) 

* This paper won the 1989 IChemE Moulton Medal for the Best Paper published in their Transactions for the year, by the Institution of Chemical Engineers, UK.

 Conference Publications 

de Alwis, AAP and Fryer, PJ ?Preliminary experiments on heat transfer during the ohmic heating of foods' in Procs. of the 2nd UK Nat.Heat.Transf.Conf., Vol I, IMechE, 229-239, 1988.

de Alwis, AAP and Fryer PJ ?Mathematical modelling of the ohmic heating process' in Engineering Innovation in the Food Industry; its role in Quality Assurance, (Eds) RB Field and JA Howell, Elsevier, 45-58, 1990.

de Alwis AAP and Zaror CA ?Modelling Spray Evaporation using Equation Oriented Process Simulators', Food Engineering in a Computer Climate, (30 March - 1 April 1992, Cambridge, UK)

de Alwis AAP, Varley J and Niranjan K ?Simulation of Thermal Food Processing Operations (Blanching and Canning)', Food Engineering in a Computer Climate, (30 March - 1 April 1992, Cambridge, UK)

Calcavecchcia B, de Alwis AAP and Niranjan K ?Freeze Drying of Food and Agricultural Materials - Experimental and Simulation studies', B. Calcavecchcia, AAP de Alwis and K Niranjan, Ag Eng.'92, Uppsala, 1-5 June, 1992.

Edirisinghe EMRKB, Samaranayake CP, Bamunuarachchi A, Walpala, S, and de Alwis AAP (1997), Nutrient retention in ohmic processing, Procs of Seventh International Congress on Engineering and Food, Brighton, UK, 13-17 April, 1997

Wijayapala S, de Silva NGH and de Alwis AAP (1998), Positive environmental management via waste minimization in a textile washing facility, Procs. of the Annual Symposium Research for Industry 1998, November UoM, pp157-167.

de Alwis AAP (2001), Biogas! A Natural energy choice for both rural and urban environments, in Renewable Energy Technologies: Applications to Industries and Agriculture, Palaniappan C.; Kolar A.K. and Haridasan TM (Eds.) pp 252-260.

Membership in professional Bodies 

Editorial Committte - “Chemunique” The official journal of the Chemical Engineering Society.

Member of the International Editorial Board: IChemE (UK) Transactions C Food and Bioproducts Processing Journal

Editor – ERU News – Newsletter of the Engineering Research Unit, Faculty of Engineering, University of Moratuwa (1998-2000)