Abstract Dynamic behavior of hydrophilic microparticles impacting on the particle-laden interface is experimentally studied using a high-speed camera at different properties of particle layer and subphase. When the hydrophilic microparticle impacts on the particle-laden interface, its surface is likely to change from Wenzel to Cassie-Baxter state. Three types of impact behavior can be identified, namely, rebound, suspension, and submergence. Especially, the particles will suspend under the particle-laden interface due to the interaction between impact particles and particle-laden interface. The properties of the particle layer and subphase show little influence on the normal coefficient of restitution, while the tangential coefficient of restitution is significantly affected by the particle size at the layer. A modified penetration probability is proposed as an exponential function of the inertial, modified capillary and hydrodynamic forces with introducing effective interfacial viscosity and additional coefficient of capillary force. The collision force of microparticles with the particle-laden interface and hydrodynamic force displacing the surrounding stationary liquid are the main factors influencing the penetration probability.

中文翻译：

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亲水性微粒对载有粒子的界面的冲击行为

摘要 使用高速相机在粒子层和亚相的不同特性下，实验研究了亲水性微粒撞击载有粒子的界面的动力学行为。当亲水性微粒撞击载有颗粒的界面时，其表面可能会从 Wenzel 状态变为 Cassie-Baxter 状态。可以识别三种类型的冲击行为，即回弹、悬挂和淹没。特别是，由于撞击粒子和载粒子界面之间的相互作用，粒子将悬浮在载粒子界面之下。颗粒层和亚相的性质对法向恢复系数影响不大，而切向恢复系数受层处粒径的影响显着。修正的穿透概率被提议为惯性、修正的毛细管力和流体动力的指数函数，引入有效的界面粘度和附加的毛细管力系数。微粒与载有粒子的界面的碰撞力和置换周围静止液体的水动力是影响穿透概率的主要因素。