Dynamics of sheared droplets filled with non-Brownian particles

Helene Van Ammel, Paula Moldenaers, Ruth M. Cardinaels (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The dynamics of single droplets containing non-Brownian particles are studied. The particle over droplet size ratio (r/R) is changed by using different particle sizes (r/R = 0.02–0.4). Additionally, the effect of particle concentration (5–20 vol%) is investigated. The dynamics of droplets with r/R = 0.02 show good agreement with the corresponding particle-free reference system which has a comparable viscosity ratio. Hence, this droplet phase can be considered as a homogenous medium characterized by its bulk viscosity which is governed by the particle concentration. However, droplets with r/R ≥ 0.1 show a more suppressed deformation and slower transient dynamics and, therefore, behave as a slightly more viscous medium than expected based on their bulk viscosity. These effects become more pronounced at higher particle concentrations and higher r/R. Moreover, local particle effects like asymmetric droplet shapes, oscillating droplet shapes, and tip streaming start to influence the droplet dynamics at particle concentrations around 15 vol%.
Original languageEnglish
Pages (from-to)935–949
Number of pages15
JournalRheologica Acta
Volume59
Issue number12
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Droplet dynamics
  • Emulsions
  • Non-Brownian particles
  • Particle-filled systems
  • Polymer blends

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