Recent Developments in NTC Chemistry and Low-Temperature Flames

Title:Recent Developments in NTC Chemistry and Low-Temperature Flames

Reporter:Prof. C. K. Law

                    Princeton University and Tsinghua University

Time:Sept.29th  (Thursday) 3:00pm-5:00pm

Place:B-515, Lee Shau Kee Building of Science and Technology

Abstract:The recognition that the classical cool flame phenomena, frequently observed in homogeneous mixtures, can actually be low-temperature flames having the fundamental diffusive-reactive flame structure, have evolved as one of the most exciting developments in recent combustion research. The seminar will first provide: (1) an overview of the negative-temperature-coefficient (NTC) chemistry that characterizes the low-temperature chemistry of many large hydrocarbon molecules; to be followed by recent developments in: (2) the chemistry of the first ignition delay as well as the lower and upper turnover states of the NTC response; (3) the structure, propagation and extinction of the 1D planar premixed cool flames, in the doubly infinite domain, and the extended flammability limits; (4) the existence and properties of compound ignition-extinction S-curves, with a secondary cool flame S-curve grafted onto the lower branch of the primary hot flame S-curve for both premixed and nonpremixed cool flames in the counterflow; and (5) experimental observations of these cool flames.  Directions for further research will be discussed. 

Brief Biography:Chung K. Law received his Ph.D. in Engineering Physics from the University of California at San Diego in 1973, and currently is the Robert H. Goddard Professor of Mechanical and Aerospace Engineering at Princeton University and the director of the Center for Combustion Research at Tsinghua University. His research interests cover various physical and chemical aspects of fundamental combustion phenomena, with applications to propulsion, energy, fuels and the environment. As of 2016 he has published over 475 journal articles, with over 10,000 SCI citations by others and an SCI h-index of 59, and was identified by Thomson Reuters as a Highly Cited Researcher in 2014 and 2015.  For his research accomplishments he has been honored with a number of professional awards, and an honorary Doctor of Engineering from the Hong Kong Polytechnic University in 2012. He is a fellow of the American Institute of Aeronautics and Astronautics (AIAA), the American Society of Mechanical Engineers (ASME), the American Physical Society (APS), the American Academy of Arts and Sciences (AAAS), and the American Association for the Advancement of Science (AAAS), a member of the US National Academy of Engineering (NAE), and a past president of the Combustion Institute.