Multiscale liquid drop impact on wettable and textured surfaces
ORAL
Abstract
We present the impact of microscopic liquid droplets on solid surfaces which are flat, or pillared, with either homogeneous interactions or cross-shaped patterns of wettability using numerical simulations. The focus is on relatively low impact velocities leading to spreading or bouncing drops, rather than splashing. Lattice Boltzmann and Molecular dynamics methods are used for nanometer-sized and continuum droplets, respectively, and the results of the two methods are compared in terms of scaled variables. In most situations we find similar droplet behavior at both length scales. The agreements between the methods are reasonable at low impact velocities on wettable surfaces while some discrepancies are observed for strongly hydrophobic surfaces and for higher velocities.
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Authors
Samaneh Farokhirad
Department of Mechanical Engineering, City College of City University of New York
Rui Zhang
Benjamin Levich Institute and Department of Physics, City College of City University of New York
City College of New York
Joel Koplik
City College of CUNY
Benjamin Levich Institute and Department of Physics, City College of City University of New York
Department of Physics, City College of New York
City College of New York
Taehun Lee
City College of City University of New York
Department of Mechanical Engineering, City College of City University of New York
Mechanical Engineering Department, City College of City University of New York
City College of New York
Department of Mechanical Engineering, City College of City University of New York, New York, 10031, USA
City College of the City University of New York
Mechanical Engineering, The City College of New York
