Biofluiddynamics    Drops    Bubbles    Elastocapillarity     Nanofabrication   






Elastocapillary coalescence of plates and pillars


When a paintbrush is dipped into a bucket of paint and pulled out, surface tension forces cause the individual hairs in the brush to coalesce which simultaneously becomes impregnated with paint. We study such elastocapillary interactions by conducting simple experiments and solving free-boundary problems.


Related publications
1. H.-Y. Kim and L. Mahadevan, “Capillary rise between elastic sheets,” Journal of Fluid Mechanics, 548, 141-150 (2006)
2. H.-M. Kwon, H.-Y. Kim, J. Puell, and L. Mahadevan, “Equilibrium of an elastically confined liquid drop,”
Journal of Applied Physics, 103, 093519 (2008)

3. K. J. Park and H.-Y. Kim, “Bending of floating flexible legs,” Journal of Fluid Mechanics, 610, 381-390 (2008)

4. Z. Wei, T. M. Schneider, J. Kim, H.-Y. Kim, J. Aizenberg, and L. Mahadevan, Elastocapillary coalescence of plates and pillars,” Proceedings of the Royal Society A 471, 20140593  (2015)

5. T.-H. Kim, J. Kim, and H.-Y. Kim, “Evaporation-driven clustering of microscale pillars and lamellae,” Physics of Fluids 28, 022003 (2016)

6. M. Lee, S. Kim, H.-Y. Kim, and L. Mahadevan, “Bending and buckling of wet paper,” Physics of Fluids 28, 042101 (2016)





Zippering of flexible elements


The following movie shows zippering of a flexible train of rods floating on a viscous liquid near a vertical wall. The self-assembling dynamics of the trains are the results of the capillary interaction between a wall and the train, and non-capillary interactions due to inextensible connection between the rods.

Related publications

1. D. Vella, H.-Y. Kim, and L. Mahadevan,
The wall-induced motion of a floating flexible train, Journal of Fluid Mechanics 502, 89-98 (2004)


Zippering of 4 rods on ethylene glycol surface; Quicktime movie
The actual process takes 74 seconds.



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Micro Fluid Mechanics Laboratory

Department of Mechanical and Aerospace Engineering

Seoul National University, Korea