Professor and Associate Head, Research and Graduate Studies
P.Eng., B.A.Sc. (British Columbia), M.Sc., Ph.D. (Cal. Tech.), Associate Director, Clean Energy Centre
Aerosols are liquid or solid particles suspended in a gas. Solid nanoparticles (ie., diameters much less than 1 micron) are produced by combustion processes (eg., diesel engines), and as an atmospheric contaminant, they can have a major impact on climate forcing as well as on human health. It is important to understand the impact of these particles, and more importantly, reduce concentrations of these particles in the indoor and outdoor environments. This overall motivation for my research has taken me and my students down several interconnected paths.
- The first path has been to understand how particle morphology of solid, fractal-like particles (such as soot) affects the transport properties and measurement of the particles. This is an essential component of conducting experimental research on fractal nanoparticles, and an important ingredient in models of particle formation in engines. A related research project has sought to characterize the difference in real particle morphology as a function of engine operating conditions.
- A second path has been the development of new fuel injectors and injection strategies to minimize particle formation in compression ignition engines. This work, done in collaboration with Westport Innovations has been applied and experimental, but my group is working on new phenomenological models of particle formation in engines.
- A third stream of research aims to reduce aerosol concentrations where people spend most of their time – inside buildings. Here the challenge is to remove harmful nanoparticles using filtration systems that do not require excessive energy consumption.
Current Research Work
I am actively pursuing all three research threads above, and interested in bringing new experimental and theoretical techniques to these problems. Graduate student applicants interested in working in these areas should have strong fundamentals in fluid mechanics, heat transfer and a talent for experimental research.
- E. Faghani and S. N. Rogak, “A phenomenological model of two circular turbulent jets,” International Journal of Engine Research, vol. 14, no. 3, pp. 293–304, 2013.
- S. H. Park, S. N. Rogak, and A. P. Grieshop, “A Two-Dimensional Laminar Flow Model for Thermodenuders Applied to Vapor Pressure Measurements,” Aerosol Science and Technology, vol. 47, no. 3, pp. 283–293, 2013.
- R. Ghazi, H. Tjong, A. Soewono, S. N. Rogak, and J. S. Olfert, “Mass, mobility, volatility, and morphology of soot particles generated by a McKenna and inverted burner,” Aerosol Science and Technology, vol. 47, no. 4, pp. 395–405, 2013.
- A. Soewono and S. N. Rogak, “Morphology and Optical Properties of Numerically Simulated Soot Aggregates,” Aerosol Science and Technology, vol. 47, no. 3, pp. 267–274, 2013.
- K. Karakama, S. N. Rogak, and A. Alfantazi, “Characterization of the deposition and transport of magnetite particles in supercritical water,” The Journal of Supercritical Fluids, vol. 71, pp. 11–18, 2012.
- S. N. Rogak, W. K. Bushe, and G. McTaggart-Cowan, Concurrent injection of liquid and gaseous fuels in an engine. Google Patents, 2012.
- S. Munshi, G. P. McTaggart-Cowan, S. N. Rogak, and W. K. Bushe, Method and apparatus of fuelling an internal combustion engine with hydrogen and methane. Google Patents, 2012.
- A. P. Grieshop, D. Boland, C. C. Reynolds, B. Gouge, J. S. Apte, S. N. Rogak, and M. Kandlikar, “Modeling air pollutant emissions from Indian auto-rickshaws: Model development and implications for fleet emission rate estimates,” Atmospheric Environment, vol. 50, pp. 148–156, 2012.
- B. Patychuk and S. N. Rogak, “Particulate Matter Emission Characterization From a Natural Gas Fuelled High Pressure Direct Injection Engine,” in ASME 2012 Internal Combustion Engine Division Fall Technical Conference, 2012, pp. 447–455.
- J. F. Montgomery, S. I. Green, S. N. Rogak, and K. Bartlett, “Predicting the energy use and operation cost of HVAC air filters,” Energy and Buildings, vol. 47, pp. 643–650, 2012.