Application of a high density ratio lattice-Boltzmann model for the droplet impingement on flat and spherical surfaces

Duo Zhang, K. Papadikis*, Sai Gu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

In the current study, a 3-dimensional lattice Boltzmann model which can tolerate high density ratios is employed to simulate the impingement of a liquid droplet onto a flat and a spherical target. The four phases of droplet impact on a flat surface, namely, the kinematic, spreading, relaxation and equilibrium phase, have been obtained for a range of Weber and Reynolds numbers. The predicted maximum spread factor is in good agreement with experimental data published in the literature. For the impact of the liquid droplet onto a spherical target, the temporal variation of the film thickness on the target surface is investigated. The three different temporal phases of the film dynamics, namely, the initial drop deformation phase, the inertia dominated phase and the viscosity dominated phase are reproduced and studied. The effect of the droplet Reynolds number and the target-to-drop size ratio on the film flow dynamics is investigated.

Original languageEnglish
Pages (from-to)75-85
Number of pages11
JournalInternational Journal of Thermal Sciences
Volume84
DOIs
Publication statusPublished - Oct 2014

Keywords

  • Droplet impact
  • Film thickness
  • High-density-ratio
  • Lattice Boltzmann
  • Multiphase flow
  • Spread factor

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