Sungyon Lee - Interfaces: wind, droplets, and bubbles
| Dates: | 28 October 2020 |
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| Times: | 14:00 - 15:00 |
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| What is it: | Seminar |
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| Organiser: | Department of Mathematics |
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| Who is it for: | University staff, External researchers, Current University students |
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Sungyon Lee (Minnesota) joins us for this virtual seminar in the Physical Applied Mathematics Series
Interfaces: wind, droplets, and bubbles
Abstract:
In this talk, we will present two projects that pertain to the dynamics of fluid-fluid interfaces. First, we experimentally and theoretically demonstrate the effect of inertial air flows that are applied to a partially-wetting water droplet 1. Reminiscent of air drying processes, the droplet exhibits complex behaviors — hanging, splitting, and depinning, depending on the strength and configuration of the applied wind. A mathematical model qualitatively captures the evolution of the 2D drop and the splitting transition, by combining the potential flow and lubrication approximations. In the second part of the talk, we discuss the result of injecting air into a packing of soft hydrogel beads that are saturated in water 2. We find that this new combination of buoyancy, capillarity, and elasticity under confinement leads to complex morphologies of air migration, as well as nontrivial dynamics in the amount of trapped air in the system.
1 A. Hooshanginejad, C. Dutcher, M. Shelley and S. Lee, “Droplet breakup in a stagnation-point flow,” Journal of Fluid Mechanics (2020) 901, A19
2 S. Lee, J. Lee, R. Le Mestre, F. Xu, and C. MacMinn, “Migration, trapping, and venting of gas in a soft granular material,” Physical Review Fluids (2020) 5, 084307
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