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Multiphase static droplet simulations in hierarchically structured super-hydrophobic surfaces

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Abstract

The surface of first part of study is textured with microscopic pillars of prototypical top geometries as a rectangle. The second one is textured with a hierarchical structure, composed of secondary pillar structures added on the primary texture. The length ratio between two scales of texture is 1:16. We evaluated the non-wetting characteristics of two types of surfaces by measuring CAs as well as the transition from the Wenzel’s to Cassie’s regimes. We measure the Contact angles (CAs), using the Lattice Boltzmann model (LBM), for two different surface configurations. We evaluated the effect of the hierarchical structure; the robustness of the Cassie regime is enhanced and the apparent contact angle is increased by the secondary structures. This is achieved by increasing the energy barrier against the transition between wetting and non-wetting regimes.

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Authors and Affiliations

  1. School of Mechanical Engineering, Yonsei University, Seoul, 120-749, Korea

    Jung Shin Lee & Joon Sang Lee

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  1. Jung Shin Lee
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  2. Joon Sang Lee
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Correspondence to Joon Sang Lee.

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Recommended by Associate Editor Suk Goo Yoon

Joon Sang Lee is an Associate Professor of School of Department of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea. He received his doctor degree in Mechanical Engineering from Iowa State University. His research interests is mainly on computational fluid dynamics, including biomechanics and hemodynamics and multi-scale fluid dynamics.

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Lee, J.S., Lee, J.S. Multiphase static droplet simulations in hierarchically structured super-hydrophobic surfaces. J Mech Sci Technol 30, 3741–3747 (2016). https://doi.org/10.1007/s12206-016-0736-y

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  • DOI: https://doi.org/10.1007/s12206-016-0736-y

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