Droplet impingement and wetting behavior on a chemically heterogeneous surface in the Beyond-Cassie-Baxter regime

Guina Yi, Ziqi Cai*, Zhengming Gao*, Zhichao Jiang, Xiongbin Huang, J. J. Derksen

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Droplet impingement and anisotropic wetting on chemically heterogeneous stripe-patterned surfaces is simulated by means of many-body dissipative particle dynamics (MDPD). The ratio of the stripe width and initial droplet diameter, defined as β, ranges from 0.5 to 1.0 so that the wetting process is in the Beyond-Cassie-Baxter regime and is highly anisotropic. At zero Weber number (that is, without considering droplet inertia) and with superhydrophobic stripes, β is the only factor affecting the droplet perpendicular contact angle and aspect ratio. For inertial droplets, β and the Weber number are found to have an effect on the eventual droplet morphology on multi-striped surfaces. These morphologies include elongated shape, split-off, and “butterfly” shape. A correlation for critical split-off conditions has been determined. An energy analysis of droplet impingement shows that the normalized surface energy of the droplet is independent of the Weber number if the droplet is elongated or butterfly-shaped.
Original languageEnglish
Article numbere16263
Number of pages13
JournalAIChE Journal
Volume66
Issue number8
Early online date9 Jun 2020
DOIs
Publication statusE-pub ahead of print - 9 Jun 2020

Keywords

  • Anisotropic wetting
  • droplet impingement
  • many-body dissipative particle dynamics
  • droplet evolution
  • surface energy
  • anisotropic wetting
  • SHAPES
  • TENSION
  • VISCOSITY
  • SIMULATION
  • ANISOTROPY
  • IMPACT
  • COALESCENCE
  • KINETICS
  • DYNAMICS

Fingerprint Dive into the research topics of 'Droplet impingement and wetting behavior on a chemically heterogeneous surface in the Beyond-Cassie-Baxter regime'. Together they form a unique fingerprint.

  • Cite this