• Thermodynamics
• Refrigeration & Air Conditioning
• Fluid Dynamics

• Master of Philosophy in Mechanical Engineering, University of Ruhuna, Sri Lanka.
• Postgraduate Diploma in Chemical Engineering, University of Moratuwa, Sri Lanka.
• Bachelor of Science in Chemical Engineering, University of Peradeniya, Sri Lanka.
• Professional Qualifications • Senior Lecturer, Department of Mechanical & Manufacturing Engineering, University of Ruhuna, Sri Lanka (2021.12.10 to Up to date).
• Lecturer, Department of Mechanical & Manufacturing Engineering, University of Ruhuna, Sri Lanka (2012.01.02 to 2021.12.09)

Journal Papers

• T. K. K. S. Pathmasiri, G. I. P. Perera & R. Gallage (2022) Investigation of palm-castor oil blends as base stocks of bio-lubricants for industrial applications, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 44:1, 1354-1374.
  DOI: 10.1080/15567036.2019.1643425
• Pathmasiri, T. K. K. S. and Perera, G. I. P. (2020) ‘Potential of using polyethylene as viscosity enhancer of palm oil to use as a lubricating oil’, Advances in Mechanical Engineering, 12(11), pp. 1–13. DOI:10.1177/1687814020970745.

Conference Papers

• Dissanayaka, D. M. T. A. L., Marasinghe, S. M., Rajapaksha, P. K. M., Sandeepa, R. M. E. C. & Pathmasiri, T. K. K. S. (2024). Design and Fabrication of Maize on cob Tray Dryer. 21st Academic Sessions, Faculty of Graduate Studies & Library, University of Ruhuna, Sri Lanka. 60.
• Bandara N.M.C.H., Maduranga D.V.G., Balasooriya B.M.J.S, Pathmasiri T.K.K.S., and Perera G.I.P., Palm oil as an Engine Oil in Single Cylinder Tractor, Proceedings of 20th Academic Sessions, University of Ruhuna, Sri Lanka, Jun 7, 2023, pp 86.
• Siriwardhana E.W.A.R.B., Wanigasinghe C.M., Pathmasiri T.K.K.S., and Perera G.I.P., Development of Test-rig to Investigate Effectiveness of Hydraulic Oil, Proceedings of 19th Academic Sessions, University of Ruhuna, Sri Lanka, Mar 2, 2022, pp 80.
• Pathmasiri T.K.K.S., Perera G. I. P., and Gallage R., Development of Alternative Hydraulic Fluid Using Palm Oil, Proceedings of 16th Academic Sessions, University of Ruhuna, Sri Lanka, Apr 6, 2019; pp 44.
• Sahthan K.R.A., Thinesh K., Pathmasiri T.K.K.S., and Perera G.I.P., Design and Development of a Scuffing Load Capacity Tester for Comparisons of a Novel Plant Based Lubricant with Standard Lubricants, Proceedings of the International conference on Advanced materials for Clean Energy and health Applications (AMCEHA-2019), February 6-8, 2019, University of Jaffna, Sri Lanka, pp 118.
• Pathmasiri T.K.K.S. and Perera G.I.P., Improving the Palm Oil Properties to use as an Alternative Hydraulic Oil, South Asia Conference on Multidisciplinary Research 2018 (SAMR’ 2018), 05-06 Oct 2018, Colombo, Sri Lanka, pp 17.
  Pathmasiri T.K.K.S., Perera G.I.P., and Gallage R., Investigating the lubricating properties of Palm Oil and White Coconut Oil, Proceedings of 15th Academic Sessions, University of Ruhuna, Sri Lanka, Mar 7, 2018, pp 87.
• Pathmasiri T.K.K.S., and Kalpage C.S., Effect of Temperature on Acid Esterification of Free Fatty Acids in Chicken Fat, Proceedings of 11th Academic Sessions, University of Ruhuna, Sri Lanka, 2014, pp 56.
• Pathmasiri T.K.K.S., and Kalpage C.S., Study of chemical kinetics of a Bio-Diesel Pre- Processing Reaction, Abstracts of the 1st Annual Research Symposium, Faculty of Engineering, University of Ruhuna, 2014, pp 51.
• Pathmasiri K, Haugen F., and Gunawardena S., Simulation of Biogas reactor for dairy manure, 107th Annual Sessions of the Institute, The Institute of Engineers, Sri Lanka, 2013, pp 394- 398.
• Pathmasiri T.K.K.S., Karunarathna S.P.N.D., Perera G.I.P., and Gallage R., Comparison of Lubricating Properties of Palm Oil and Palm Kernel Oil with Commercial Engine Oils, Proceedings of 14th Academic Sessions, Faculty of Engineering, University of Ruhuna, Sri Lanka, Mar 1, 2017, pp 43.

IESL

Research Interests

• Energy
• Composites
• Lubricating Oil
• Biogas
• Biodiesel