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Study of the wetting characteristics of water droplet on a heterogeneous pillared surface

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Abstract

We investigated the wetting characteristics of a water droplet on a heterogeneous pillared surface at the nano-scale including contact angle, molecule inflow percentage and density fields and compared them with the wetting characteristics of a water droplet on a homogeneous pillared surface. Molecular dynamics simulations were employed to analyze the wetting behavior of water droplets on surfaces with pillar structures by considering different potential energies including bond, angle, Lennard-Jones and Coulomb to calculate the interacting forces between water molecules and the surface. The heterogeneous surfaces considered had pillars with a different surface energy than the base surface. It was found that the difference in surface energy between the base surface and pillar had little effect on the hydrophobicity of the surface at low pillar heights. However cases with pillar heights over H = 4.24 Å, the pillar surface energy has a larger effect on the molecule inflow percentage with the maximum differences in the range from 33.8% to 47.2% depending on the base surface energy. At a pillar height of H = 16.96 Å, the pillar surface energy has a large effect on the contact angle of the water droplet with the maximum differences in the range from −26.1% to −40.62% depending on the base surface energy. There was a large variation in the contact angle of the droplet as the pillar height increased when there was a large difference in the surface energies between the base and the pillars.

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, San 30, Jangjeon-dong, Geumjeong-gu, Busan, 609-735, Korea

    Jeong-Ahn Ko, Tae Woo Kwon & Man Yeong Ha

  2. Department of Environmental Administration, Catholic University of Pusan, 57 Oryundae-ro, Geumjeong-gu, Busan, 609-757, Korea

    Matthew Ambrosia

Authors
  1. Jeong-Ahn Ko
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  2. Tae Woo Kwon
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  3. Matthew Ambrosia
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  4. Man Yeong Ha
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Correspondence to Man Yeong Ha.

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Recommended by Associate Editor Suk Goo Yoon

Jeong-Ahn Ko received his B.S. degree in Mechanical Engineering from Pusan National University, Korea in 2007. Mr. Ko is currently a Ph.D student at the Pusan National University in Busan, Korea. His research interests are focused on thermal management, computational fluid dynamics, and molecular dynamics.

Man Yeong Ha received his B.S. degree from Pusan National University, Korea, in 1981, M.S. degree, in 1983, from Korea Advanced Institute of Science and Technology, Korea, and Ph.D. degree from Pennsylvania State University, USA in 1990. Dr. Ha is currently a professor at the School of Mechanical Engineering at Pusan National University in Busan, Korea. Dr. Ha is also currently a director of Rolls-Royce and Pusan National University Technology Centre in Thermal Management. He serves as an associate Editor of the Journal of Mechanical Science and Technology. His research interests are focused on thermal management, computational fluid dynamics, and micro/nano fluidics.

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Ko, JA., Kwon, T.W., Ambrosia, M. et al. Study of the wetting characteristics of water droplet on a heterogeneous pillared surface. J Mech Sci Technol 29, 1243–1256 (2015). https://doi.org/10.1007/s12206-015-0238-3

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  • DOI: https://doi.org/10.1007/s12206-015-0238-3

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