Hui Hu, Ph.D.Anson Marston Distinguished Professorship in Engineering and Martin C. Jischke Professor in Aerospace Engineering, Iowa State University.
Friday, November 15th, 2024, 3:00 - 4:00 PM
In Person JH-109
Title: Development of Advanced Diagnostic Techniques for Complex Thermal Flow Studies
ABSTRACT: The talk will start with a description of the recent progress made by the speaker in developing a novel molecule-based flow diagnostic technique, named Molecular Tagging Velocimetry and Thermometry (MTV&T), for simultaneous measurements of flow velocity and temperature distributions in fluid flows. Unlike most used particle-based flow diagnostic techniques such as Particle Image Velocimetry (PIV), MTV&T utilizes specially designed phosphorescent molecules, which can be turned into long-lasting glowing marks upon excitation by photons of appropriate wavelength, as the tracers for both flow velocity and temperature measurements. The uniqueness of the MTV&T technique will be demonstrated from the application examples to study the thermal effects on the wake instabilities behind a heated cylinder, to quantify the transient behavior of electroosmotic flows in electrokinetically-driven microfluidics, and to characterize shockwave and boundary layer interactions in supersonic flows. A novel digital image projection (DIP) technique will also be introduced to achieve quantitative measurements of the droplet/film thickness distributions to quantify the dynamic impact process of water droplets onto solid surfaces with different impact velocities and surface wettability. Based on the time-resolved DIP measurements, the time evolution of the droplet shapes in the course of the dynamic impact process, i.e., the spreading, receding, and oscillating of the impinging droplets under different test conditions, are revealed clearly and quantitatively. The quantitative measurements are very helpful to improve our understanding of the important micro-physical processes pertinent to aircraft icing phenomena for the development of more effective anti-/de-icing strategies for aircraft icing mitigation.
BIO: Dr. Hui Hu is an Anson Marston Distinguished Professorship in Engineering and Martin C. Jischke Professor in Aerospace Engineering at Iowa State University. His research interests include laser-based flow diagnostics, aircraft/aero-engine icing physics and anti-/de-icing; green aviation and electric propulsion; supersonic/hypersonic aerodynamics; renewable energy and wind turbine aeromechanics. He is an ASME Fellow and AIAA Associate Fellow and received several prestigious awards in recent years, including 2006 NSF-CAREER Award; 2007 Best Paper in Fluid Mechanics Award of IOP Publishing UK; 2009 AIAA Best Paper Award in Applied Aerodynamics; 2012 Mid-Career Achievement in Research Award of Iowa State University; 2013 AIAA Best Paper Award in Ground Testing Technology; 2014 Renewable Energy Impact Award of Iowa Energy Center; 2022 AIAA Best Paper Award on Gas Turbine Engine; and 2023 D.R. Boylan Eminent Faculty in Research Award of Iowa State University. Further information about Dr. Hu’s education and technical background is available at http://www.aere.iastate.edu/~huhui/.
