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Computational fluid dynamics for slurry rheology in flow battery and underlying drag-reduction mechanisms in turbulent flow control
This talk will start by introducing diverse fluid-mechanics research conducted in the Park research group, including complex fluids, electrokinetics, biofluids, transition-to-turbulence, and turbulent flow. I will then focus on two projects at very different flow regimes. For both projects, the modeling, analysis, and computation will be presented along with their engineering applications. The first project is dedicated to a creeping flow or Stokes flow, where dynamics and rheology of highly conductive particle suspensions in an electric field are investigated to help design flow battery slurries. Notably, the negative particle pressure is found to arise at high concentrations, which could be considered a first-of-its-kind in such particle systems. The second project is dedicated to a high-speed flow or turbulent flow, where three flow-control methods are investigated to elucidate their underlying drag-reduction mechanisms. These methods include imposing an external body force, adding long-chain polymers, and utilizing slip surfaces. A temporal analysis based on high- and low-drag periods is employed, showing that the polymer and slip methods exhibit a similar mechanism, while the body force method is different. I will conclude by providing the implications of these different drag-reduction mechanisms.
Dr. Jae Sung Park is an Assistant Professor in the Department of Mechanical and Materials Engineering at the University of Nebraska-Lincoln (UNL). He received his B.S. from Hanyang University in 2006 and his M.S. and Ph.D. from the University of Illinois at Urbana-Champaign in 2008 and 2012, respectively. All degrees are in Mechanical Engineering. Prior to coming to UNL in 2017, Dr. Park was a postdoctoral researcher in the Department of Chemical and Biological Engineering at the University of Wisconsin-Madison from 2012 to 2016. His research encompasses a wide range of fluid mechanics from low to high Reynolds number flows, involving complex fluids, biofluids, transition-to-turbulence, and turbulent drag reduction. His research has been supported by the National Science Foundation (NSF), the Department of Energy, and NASA Nebraska. He was awarded the NSF CAREER award in 2021 and the UNL College of Engineering New Faculty Teaching Award in 2020.