Sungkyunkwan University · Engineering
Professor Han Seo Ko's research lab specializes in experimental and theoretical fluid dynamics, focusing on transient multiphase flows and interfacial phenomena. The lab investigates complex fluid behaviors such as transient density distributions using advanced optical diagnostics like digital speckle tomography and particle image velocimetry (PIV). Key research directions include Marangoni convection driven by volatile liquid evaporation and absorption, with an emphasis on the role of vapor pressure and solubility in shaping internal flow patterns. The lab combines high-speed imaging, interferometry, and scaling models to understand and predict dynamic fluid behaviors at microscale interfaces.
Figures are computed from collected data and may differ slightly.
A form of digital speckle tomography has been proposed for calculating transient three-dimensional density distributions. Multiple CCD images have captured movements of speckles due to the variation in density among three angles of view simultaneously and instantaneously so that asymmetrical and transient flows can be measured. Initially, the variations in density of one-nozzle and two-nozzle test sections have been investigated by the use of a cross-correlation method involving the speckle disp
We experimentally and analytically studied vapor-driven solutal Marangoni flow by varying volatile liquid sources on top of the water droplet. We checked and compared the effects of solubility and vapor pressures of volatile liquids on the internal flow pattern using particle image velocimetry (PIV) and the droplet shape using shadowgraphy experiments. To explain the internal flow, we explored the absorption and evaporation mechanism of the vapors and we found that Henry's constant of the volati
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