Abstract The effect of the surface viscoelasticity on the drainage of the film between two gently colliding fluid particles is studied. The interfaces bounding the thin film are treated as deformable ones, which follow the surface analogous of the Upper Convected Maxwell model. The presence of the elastic forces on the interface is found to delay the viscous response of the interface, i.e., the interface behaves as inviscid for a certain duration before recovering the Newtonian behavior. The duration of this delay scales with the magnitude of the surface Weissenberg number, whereas the surface viscous forces determine the time at which the deviation from the inviscid behavior begins. This delay also indicates a shift in the tangential mobility of the interface with time during the drainage, as the inviscid and the Newtonian interfaces’ are the most mobile and the least mobile cases, respectively. Consequently, the coalescence time and behavior show a similar shift, yielding cases where the coalescence time estimated for the viscoelastic interface is significantly different than both the ones for the inviscid and the Newtonian interfaces.

中文翻译：

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表面粘弹性对薄膜排水和界面迁移率的影响

摘要 研究了表面粘弹性对两个轻柔碰撞流体颗粒之间薄膜排水的影响。包围薄膜的界面被视为可变形界面，其遵循类似于上对流麦克斯韦模型的表面。发现界面上存在弹性力会延迟界面的粘性响应，即界面在恢复牛顿行为之前的一段时间内表现为无粘性。这种延迟的持续时间与表面魏森伯格数的大小成比例，而表面粘性力决定了开始偏离无粘性行为的时间。这种延迟也表明在排水过程中界面的切向迁移率随时间发生了变化，因为无粘界面和牛顿界面分别是最具移动性和最不移动的情况。因此，聚结时间和行为表现出类似的转变，产生粘弹性界面估计的聚结时间与无粘性和牛顿界面的聚结时间显着不同的情况。