The spreading dynamics of a drop deposited on a superhydrophilic micropillar array are qualitatively different from those on a smooth surface in that a thin fringe layer rapidly wicks into microstructures while the bulk collapses in the center. Here we experimentally measure the temporal evolution of the shapes of water and silicone oil drops on the superhydrophilic surfaces, and find various power laws that describe the spreading dynamics. The bulk radius increases initially but shrinks in the late stages for drainage of its volume by wicking. The fringe film tends to grow diffusively for the entire timespan of spreading with the effective diffusivity being a function of surface tension, pillar height, viscosity, and surface roughness. The entire footprint is shown to grow like t1/4, t being time, for the entire time range, which allows us to estimate the time for complete drop spreading.
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September 2013
Research Article|
September 27 2013
Experimental study of drop spreading on textured superhydrophilic surfaces
Seong Jin Kim;
Seong Jin Kim
1Institute for Multi-disciplinary Convergence of Matter,
Korea Institute of Science and Technology
, Seoul 136-791, South Korea
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Jungchul Kim;
Jungchul Kim
2Department of Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-744, South Korea
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Myoung-Woon Moon;
Myoung-Woon Moon
1Institute for Multi-disciplinary Convergence of Matter,
Korea Institute of Science and Technology
, Seoul 136-791, South Korea
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Kwang-Ryeol Lee;
Kwang-Ryeol Lee
1Institute for Multi-disciplinary Convergence of Matter,
Korea Institute of Science and Technology
, Seoul 136-791, South Korea
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Ho-Young Kim
Ho-Young Kim
a)
2Department of Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-744, South Korea
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a)
Author to whom correspondence should be addressed. Electronic mail: hyk@snu.ac.kr
Physics of Fluids 25, 092110 (2013)
Article history
Received:
October 16 2012
Accepted:
September 05 2013
Citation
Seong Jin Kim, Jungchul Kim, Myoung-Woon Moon, Kwang-Ryeol Lee, Ho-Young Kim; Experimental study of drop spreading on textured superhydrophilic surfaces. Physics of Fluids 1 September 2013; 25 (9): 092110. https://doi.org/10.1063/1.4821985
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