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