Bouncing dynamics of a nanodroplet impacting a superhydrophobic surface under perpendicular electric fields

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Run Liu
  • Yi-Bo Wang
  • Fang-Fang Xie
  • Shu-Wei Yang
  • Han-Wu Liu
  • Yan-Ru Yang
  • Xiao-Dong Wang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number127617
Journal / PublicationColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume630
Online published23 Sep 2021
Publication statusPublished - 5 Dec 2021

Abstract

The bouncing dynamics of a nanodroplet impacting a superhydrophobic surface under a perpendicular electric field is studied through molecular dynamics (MD) simulations. Using the electric field strength as a parameter, two bouncing regimes are identified: an inertial force rebounding (IFR) regime (E < 0.08 V Å−1) and an electric field force rebounding (EFFR) regime (E > 0.08 V Å−1). In the IFR regime, the restitution coefficient, εb, is the same as but the contact time, τc, is shorter than that without an electric field. In the EFFR regime, εb is proportional to the electric field strength, whereas τc decreases with an increase in the electric field strength. On the boundary separating the two regimes (around 0.08 V Å−1), both εb and τc increase sharply due to the droplet deformation. The droplet bounces off the surface in the shape of a sphere in the IFR regime and as a long strip in the EFFR regime. A new criterion for the bouncing of nanodroplets subjected to a perpendicular electric field is proposed based on the restitution coefficient, Weber number, characteristic length, and factor Φ. The criterion demonstrates that imposing an electric field can help the bouncing of nanodroplets.

Research Area(s)

  • Contact time, Droplet impact, Electric field, LAMMPS, Molecular dynamics, Restitution coefficient

Citation Format(s)

Bouncing dynamics of a nanodroplet impacting a superhydrophobic surface under perpendicular electric fields. / Liu, Run; Wang, Yi-Bo; Xie, Fang-Fang; Yang, Shu-Wei; Liu, Han-Wu; Yang, Yan-Ru; Wang, Xiao-Dong; Lee, Duu-Jong.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 630, 127617, 05.12.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review