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Dynamic hydrophobicity on flat and pillared graphite surfaces with different pillar surface fractions

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Abstract

The motion of a droplet on a surface is of importance to many fields. While many things are known at the macro-scale still a complete understanding of fluid flow at the nano-scale is far from being known. This study focuses on the dynamic hydrophobicity of a pillar surface with different pillar surface fractions at the nano-scale using molecular dynamics simulations. Five pillar heights and four pillar surface fractions were modeled using a graphite surface which has anisotropic characteristics due to its spaced layers. A nano-sized water droplet with 5124 molecules was run to equilibrium on each surface. Then a body force was applied and the dynamic contact angles were calculated for 5 ns. These contact angles were used to calculate the surface’s effective hydrophobicity. The droplets were categorized into one of three groups as different phenomena were identified depending on the pillar surface fraction, applied force, and pillar height. It was found that at the nano-scale smooth, flat surfaces are dynamically more hydrophobic than any of the cases with pillars. Larger pillar surface fractions tended to be more hydrophobic and the pillar surface fraction of 36% was least affected by pillar height and applied body force.

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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

    Matthew Stanley Ambrosia & Man Yeong Ha

  2. School of Applied Science, Catholic University of Pusan, 57 Oryundae-ro, Bugok-dong, Geumjeong-gu, Busan, 609-757, Korea

    Matthew Stanley Ambrosia

  3. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA

    S. Balachandar

Authors
  1. Matthew Stanley Ambrosia
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  2. Man Yeong Ha
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  3. S. Balachandar
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Correspondence to Man Yeong Ha.

Additional information

Recommended by Associate Editor Suk Goo Yoon

Matthew Stanley Ambrosia received his B.S. degree in Physics from Sam Houston State University, Texas, in 1998, M.S. degree in Mechanical Engineering from Texas A&M University, Texas, in 2001, and Ph.D. in Mechanical Engineering from Pusan National University, Korea in 2013. Dr. Ambrosia is currently a professor at the Catholic University of Pusan in the School of Applied Sciences. He resides with his lovely wife and two beautiful daughters in Busan, Korea as he seeks to bring God glory through teaching and studying nano fluidics, molecular dynamics, energy conversion and energy resources.

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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Ambrosia, M.S., Ha, M.Y. & Balachandar, S. Dynamic hydrophobicity on flat and pillared graphite surfaces with different pillar surface fractions. J Mech Sci Technol 28, 669–677 (2014). https://doi.org/10.1007/s12206-013-1178-4

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  • DOI: https://doi.org/10.1007/s12206-013-1178-4

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