ME Invited Speaker: Jiarong Hong

ME Invited Speaker:

“Revolutionizing Flow Analysis through Innovative Digital Inline Holography: From Microfluidics to Turbulent Flows”

Jiarong Hong

Professor

University of Minnesota

Tuesday, April 11, 2023, 11:00 am

GM Conference Room

Lurie Engineering Center

Seminar Zoom Link

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Abstract:

I will present the recent advancements in the field of digital inline holography (DIH) and its applications in fluid mechanics research. With the innovation in the hardware designs and computational algorithms, DIH has emerged as a compact, low-cost, and highly efficient tool for 3D flow analysis. I will demonstrate the versatility of DIH by presenting its applications in various types of flows, including microfluidics, turbulence, multiphase flows, and high-speed flows. For microfluidics, I will illustrate how DIH can be used to investigate the 3D internal flow and pattern formation during droplet evaporation. In turbulence research, I will showcase how the technique has been innovated to enable the study of flow-structure interactions and energy exchange in turbulent flow over surfaces with flexible roughness, and 3D flows in the viscous sublayer of wall-bounded turbulence. Additionally, I will show how DIH can be extended to quantify the rotation of tracer particles and measure the vorticity field in a flow, providing potentially high-resolution measurements of small-scale vortex dynamics in turbulence. Finally, I will present concrete examples to illustrate how DIH can be used to characterize spray dynamics in multi-phase flow studies and how the newly-developed darkfield multi-exposure DIH technique enables 3D tracking of high-speed particle motions.

Bio:

Jiarong Hong is a professor in the fields of Mechanical Engineering, Electrical and Computer Engineering, and the Saint Anthony Falls Laboratory at the University of Minnesota. He holds a B.S. from the University of Science and Technology of China, an M.S. from Johns Hopkins University, and a Ph.D. from the same institution in 2011. Since starting his academic career at the University of Minnesota in 2012, Professor Hong has been at the forefront of developing innovative flow imaging techniques, referred to as flowscope, to study fluid and particle movements in a variety of disciplines. His work is both innovative and interdisciplinary, addressing fundamental questions in fluid dynamics and contributing to fields such as oceanography, agriculture, robotics and sensing, microbiology, medical sciences, and material sciences. Professor Hong has received several awards, including the prestigious National Science Foundation CAREER Award, the Office of Naval Research Young Investigator Award, and the McKnight Land-grant Professorship from the University of Minnesota. His research on wind energy, supercavitation, snow settling, and Covid-19 transmission has received widespread recognition from international media and has been featured in various TV programs.