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https://hku.zoom.us/j/98506397598?pwd=TqaZDnnTJbgXD2tKeDDqVSFmJOmvqi.1

Meeting ID: 985 0639 7598

Password: 870177

Abstract:

The conversion between chemical and thermal energy often involves a spatially-heterogenous domain governed by competing physics of fluid dynamics, heat transfer, and chemical kinetics. To improve understanding and predictive capability of complex reacting flow fields, quantitative sensing and imaging techniques for temperature and species are needed. This talk examines recent advancements in mid-infrared laser absorption spectroscopy (LAS) for quantitative measurements of thermochemical gas properties in reacting flows. Benefits of LAS will be highlighted in application-oriented case studies focused on high-temperature methane pyrolysis systems for clean hydrogen production. Current limitations and challenges of LAS will be discussed and motivate further advancement. The latter part of the talk will present two recent advancements in LAS: (1) the exploitation of high-pressure spectroscopic phenomena to facilitate quantitative gas sensing in extreme conditions relevant to propulsion and energy systems; and (2) the development of a novel mid-infrared laser absorption imaging (LAI) technique and the prospects for sparse-view tomography methods in enabling quantitative, high-resolution 3D imaging of thermochemical flow structure with limited optical access.

Biography

Dr. Chuyu Wei is a Postdoctoral Fellow in the Department of Mechanical Engineering at Stanford University, where he focuses on hydrogen-related technologies, including turquoise hydrogen production from methane pyrolysis and optical hydrogen sensing in industrial applications. He received his B.S. degree from the College of Energy Engineering at Zhejiang University in 2015 and his Ph.D. from the Department of Mechanical and Aerospace Engineering at the University of California, Los Angeles (UCLA) in 2020. His doctoral research pioneered a novel laser absorption imaging technique capable of obtaining multi-dimensional, high-resolution and quantitative imaging of the thermochemical structures of reacting flows. Dr. Wei's research spans fundamental spectroscopic studies of collisional processes, optical diagnostic and imaging methods development, and experimental investigations of reacting flow physics and advanced energy technologies.

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