论文标题
粘塑料无柄滴聚结
Viscoplastic sessile drop coalescence
论文作者
论文摘要
实验研究了在两个融合的无链屈服压力下降之间形成的液体桥的演变。我们发现，桥梁的高度与粘稠的牛顿液体（$ h_0 \ sim t $ $ h_0 \ sim t $）相似，然后很长时间才能最大程度地减少其液体/气体界面能量。我们在数值上求解了最终被捕的轮廓形状，发现它取决于流体的屈服应力$τ_y$和合并角$α$，以宾厄姆数字$τ_yh_ {drop} /σ$表示，由滴剂的高度宽度宽高比修饰。我们使用对被捕形状的分析以及从为桥的演变得出的相似性解决方案中发现的长度尺度提出了桥梁的时间演变的缩放论点。
The evolution of the liquid bridge formed between two coalescing sessile yield-stress drops is studied experimentally. We find that the height of the bridge evolves similar to a viscous Newtonian fluid, $h_0\sim t$, before arresting at long time prior to minimizing its liquid/gas interfacial energy. We numerically solve for the final arrested profile shape and find it depends on the fluid's yield stress $τ_y$ and coalescence angle $α$, represented by the Bingham number $τ_y h_{drop} / σ$ modified by the drop's height-width aspect ratio. We present a scaling argument for the bridge's temporal evolution using the length scale found from an analysis of the arrested shape as well as from the similarity solution derived for the bridge's evolution.
