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.
1. H.-Y. Kim and L. Mahadevan, “Capillary rise between
elastic sheets,” Journal of Fluid Mechanics, 548, 141-150
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,
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 A471, 20140593 (2015)
5. T.-H. Kim, J. Kim, and H.-Y. Kim,
“Evaporation-driven clustering of microscale pillars and
lamellae,” Physics of Fluids28, 022003 (2016)
6. M. Lee, S. Kim, H.-Y. Kim, and L. Mahadevan,
“Bending and buckling of wet paper,” Physics of Fluids28, 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.
“The wall-induced motion of a floating
flexible train,” Journal of Fluid Mechanics502,
Zippering of 4 rods on ethylene glycol surface;
Quicktime movie The actual process takes