跳到主要內容區
梅花

 

【工學院英文書報討論】Intelligent Opto-Thermal-Fluids: Applications in Advanced Manufacturing and Green Energy - 李明蒼教授/國立清華大學動力機械工程學系

11120E500100 College of Engineering Seminar
工學院英文書報討論

主題 TOPIC
▸ Intelligent Opto-Thermal-Fluids: Applications in Advanced Manufacturing and Green Energy

摘要 Abstract
❝ This presentation focuses on our studies in the photo-thermal energy conversion enhancement and novel applications in multiscale additive manufacturing. The first section is emphasized on the development of a microscale solar-thermal reformer for hydrogen production with nanocatalyst Preliminary experiments were conducted to investigate the performance of the nanocatalyst integrated in a solar thermal reformer. The second example is a study on solar-drying of porous thin plates with the assistance of nanowire matrix in an attempt on enhancing the solar energy harvesting and utilization. Silicon nanowire was investigated as a potential solar energy absorber. The significantly reduced spectral reflectivity of silicon nanowire to visible light makes it attractive in solar energy applications. Spectral hemispherical reflectivity and transmissivity of the black silicon nanowire array on silicon wafer substrate were measured. It was observed that the reflectivity is lower in the visible range but higher in the infrared range comparing to the plain silicon wafer. A drying experiment and a theoretical calculation were carried out to evaluate the effects of the trade-off between scattering properties at different wavelengths. 
 Laser direct micro-fabrication enables high design flexibility, wide range of material selectivity, low thermal impact 3D and eco-friendly precision machining, which makes it a potential technology for fabricating next generation 3D electronics. A development of novel microfabrication technologies based on laser-induced photo-thermal-chemical reactions under atmospheric environment will be presented in this talk. Specifically, a novel approach to the rapid and green manufacturing of highly conductive patterns on flexible polymer substrate is introduced. Ag and Cu based microstructures are simultaneously synthesized and patterned in a predetermined fashion using an economic continuous wave laser digital manufacturing system. The conductive patterns show great electrical conductivity and mechanical robustness. A comprehensive analysis on the physics of the microscale transport phenomena have also been carried out to investigate the coupled photo-thermal-mass transfer and the effects on the synthesis and deposition of the micro/nanostructures. In particular, a physical modeling technique on the surface tension driven flow at the interfaces of the multiphase and multiple-materials is developed and validated. In addition to assist understandings on the mechanisms and key factors that affect the surface morphology of the fabricated microstructures as well as the opto-thermal-chemical reaction dynamics, this type of physical model can also work along with experimental measurements to provide data for the development of intelligent manufacturing. The underlying physics and the state-of-the-art of technology development will be discussed in this presentation.  

講者 SPEAKER
▸ 李明蒼教授 Prof. Ming-Tsang LEE
▸ 國立清華大學動力機械工程學系 Department of Power Mechanical Engineering, National Tsing Hua University

簡歷 Short Bio
❝ Dr. Ming-Tsang Lee received his Ph.D. degree from the Department of Mechanical Engineering at University of California, Berkeley. After graduated, he had been a Postdoctoral Researcher in the University of California at Berkeley and as a Visiting Scientist in Lawrence Berkeley National Lab. Dr. Lee is specialized in energy and mass transport phenomena in micro- and nanoscales, solarthermal hydrogen productions, and laser assisted micro- and nanoscale fabrications. Since August 2018 Dr. Lee joined the Department of Power Mechanical Engineering in National Tsing Hua University as an associate professor. His current research interests include: Transport phenomena in micro/nanoscale complex opto-heat-mass multiphase flow systems, Laser assisted micro/nanoscale hybrid and green manufacturing and material processing, and Multiphysics analysis encompassing thermal-fluid-solid mechanics for renewable energy systems, advanced manufacturing processes as well as ultra-precision machinery systems.
 Dr. Lee is currently a committee member of the Committee on Nanoscale Heat Transport (K-9) in ASME (American Society of Mechanical Engineers) Heat Transfer Division. He is a recipient of Distinguished Young Scholar of Society of Theoretical and Applied Mechanics in 2018, and Outstanding Young Scholar Research Grant by NSTC (National Science and Technology Council, Taiwan) in 2017~2020. ❞

時間 TIME
▸ 2023/05/02 (TUE) 13:20 ~ 15:10

地點 VENUE
▸ 工程一館201教室 Classroom 201, Engineering Building 1

瀏覽數: