| Issue |
EPL
Volume 89, Number 2, January 2010
|
|
|---|---|---|
| Article Number | 26006 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/89/26006 | |
| Published online | 05 February 2010 | |
Roughness-gradient–induced spontaneous motion of droplets on hydrophobic surfaces: A lattice Boltzmann study
1
ICAMS, Ruhr-Universität Bochum - Stiepeler Strasse 129, 44801 Bochum, Germany, EU
2
Max-Planck Institut für Eisenforschung - Max-Planck Str. 1, 40237 Düsseldorf, Germany, EU
Corresponding author: nasrollah.moradi@rub.de
Received:
16
October
2009
Accepted:
11
January
2010
The effect of a step-wise change in the pillar density on the dynamics of droplets is investigated via three-dimensional lattice Boltzmann simulations. For the same pillar density gradient but different pillar arrangements, both motion over the gradient zone as well as complete arrest are observed. In the moving case, the droplet velocity scales approximately linearly with the texture gradient. A simple model is provided reproducing the observed linear behavior. The model also predicts a linear dependence of droplet velocity on surface tension. This prediction is clearly confirmed via our computer simulations for a wide range of surface tensions.
PACS: 68.08.Bc – Wetting / 47.55.D- – Drops and bubbles
© EPLA, 2010
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