ME Faculty Candidate Yaofa Li Research Seminar
- Monday, February 11, 2019 at 3:10pm
- Roberts Hall, 312A - view map
Experimental Studies of Complex Microscale Flows Using Particle Image Velocimetry: Applications in Porous Media Flows and Marangoni Convection
University of Notre Dame – Postdoctoral Fellow Aerospace & Mechanical Engineering
Abstract: Complex microscale flows and transport, such as multiphase flow in porous media and free surface flows are central to a range of applications in the heat and energy sector. These applications include but not limited to evaporative cooling, CO2 capture and storage (CCS), fuel cells and enhance oil recovery (EOR). Understanding the underlying physics of these complex flows at microscale is required for understanding, guiding and improving those real operations. Recent advances in micro/nanofluidics and laser-based flow diagnostics such as microscopic particle image velocimetry (micro-PIV) have provided great experimental tools for such purpose. In this talk, I will highlight the use of microfluidics and micro-PIV in the studies of two fundamental flow problems relevant to microscale heat transfer and clean energy.
In the first part of my talk, I will present the multiphase flow of supercritical CO2 and water in a 2D porous micromodel. The work is primarily motivated by the safe and secure CO2 capture and storage (CCS) for the purpose of greenhouse gas mitigation. Nevertheless, the relevance of this work goes beyond CCS, shedding light into problems such as fuel cells, enhanced oil recovery (EOR) and groundwater remediation. By taking advantage of the state-of-the-art micro-PIV, a few previously ignored phenomena are re-assessed for the first time, which challenges traditional predictive models and meanwhile provides new insights for the development of new advanced models. In the second part, I will briefly talk about a free surface flow in a thin volatile liquid layer driven by a horizontal temperature gradient, termed Marangoni convection, which is of fundamental importance for two-phase evaporative cooling. PIV measurement shows that the flow in the liquid layer destabilizes as the applied temperature gradient increases, and interestingly this flow can be purposely manipulated by carefully tuning the composition of the liquid layer and the composition of the gas phase above the liquid layer. Finally, I will conclude with a discussion of my future research vision and teaching interests and plans at MSU.
Bio: Dr. Yaofa Li is currently a postdoctoral research associate in the Department of Aerospace and Mechanical Engineering at the University of Notre Dame. His is also affiliated with the GSCO2 energy frontier research center (EFRC) based at the University of Illinois Urbana-Champaign (UIUC). He obtained his B.S. in Mechanical Engineering from the University of Science and Technology of China (USTC) in 2009 and Ph.D. also in Mechanical Engineering from Georgia Institute of Technology (Gatech) in 2015. His research interest focuses on developing experimental studies of thermal-fluid problems primarily at microscopic scales with broad applications in thermal sciences, energy, water, and the environment. He takes advantage of non-intrusive optical diagnostics, such as fluorescent microscopy and microscopic particle image velocimetry to characterize thermal and mass transport in microscale heat transfer, multiphase flow and porous media flows. He is also interested in designing and fabricating microfluidic devices with applications in thermal management and clean energy.
- Department of Mechanical & Industrial Engineering