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%.

中文翻译：

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填充非布朗粒子的剪切液滴的动力学

研究了包含非布朗粒子的单个液滴的动力学。通过使用不同的粒径 (r/R = 0.02–0.4)，颗粒与液滴尺寸之比 (r/R) 会发生变化。此外，还研究了颗粒浓度（5-20​​ vol%）的影响。r/R = 0.02 的液滴动力学与具有可比粘度比的相应无颗粒参考系统非常吻合。因此，该液滴相可以被认为是一种均质介质，其特征在于其体积粘度受颗粒浓度控制。然而，r/R ≥ 0.1 的液滴显示出更受抑制的变形和更慢的瞬态动力学，因此，其行为比基于其体积粘度预期的略高。这些影响在更高的粒子浓度和更高的 r/R 下变得更加明显。