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Physics of Fluids
https://aip.scitation.org/doi/abs/10.1063/1.5127284
■ Researchers
Seungho Kim, Joonoh Kim and Ho-Young Kim
Department of Biological and Environmental Engineering, Cornell University, Ithaca
■ Abstract
Films and drops of liquids can change their shapes and move under the spatial gradient of surface tension. A remote volatile liquid of relatively low surface tension can induce such flows because its vapor locally lowers the surface tension of the films and drops. Here, we show that aqueous liquid films thicker than approximately 100 µm can be punctured to immediately expose a dry hole by an overhanging isopropyl alcohol drop, which is attributed to the vapor-mediated Marangoni effect. We construct and corroborate scaling laws to predict the film dynamics, considering the balance of the driving capillary force and resisting viscous and hydrostatic forces as well as the contact angle of the alcohol-adsorbed solid surface. This remote scheme to induce and sustain changes of liquid morphology can be applied for fluid sculpture and patterning for industrial and artistic practices.
- Experimental Fluid Dynamics
- Artificial Intelligence
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