Senior Research Scientist
Computational Science Research Center
Korea Institute of Science and Technology (KIST), Seoul, Korea
Interactions between a solid body and a liquid-air interface play an important role in understanding multiphase flows in both engineering and natural systems. Especially in a small scale less than the capillary length, the surface tension force appears to dominate fluid behaviors, which must be solved for controlling fluid systems in numerous engineering applications and understanding animal behaviors. In this presentation, surfacetension-driven dynamics will be discussed in two categories by distinguishing the fluid motions driven by solid surface microstructure or solid motion. When a water drop touches a hydrophilic microstructured surface (so-called super-hydrophilic surface), it spreads in a different shape like an octagon and a square as the meniscus advances. Theoretical model and experimental analysis will be presented to quantify and discuss such a liquid spreading dynamics on the advancing meniscus. In the later part of the presentation, the fluid response to the solid motion will be discussed with the bio-example of jumping and non-jumping plankton. This liquid-exit dynamics is solved for a critical momentum of a liquid-exiting solid to overcome the surface tension, and investigated to describe the liquid column evolution from capillarity-driven to inertial-driven as the solid exits out with higher inertia.
Seong Jin Kim is a senior research scientist in computational science research center at Korea Institute of Science and Technology (KIST). He obtained his Ph.D. degree in biomedical engineering and mechanics from Virginia Tech. He received both M.S. and B.S. in mechanical and aerospace engineering from Seoul National University in 2010 and 2008, respectively. His research has been devoted to solving the mechanistic problems in the fluid-solid interaction while working on various engineering applications and analyzing different animal behaviors. Currently. He is working with scientific problems related to diverse filter applications such as oil-water separation and hazardous gas absorption.