论文标题
牛顿合并在胶体和非胶体悬浮液中
Newtonian coalescence in colloidal and non-colloidal suspensions
论文作者
论文摘要
吊坠和无柄滴的合并事件是由在奇异接触时产生的液体桥的形成和演变而区分的。众所周知，桥半径为$ r $，其演变为$ r \ sim t^b $，带有幂律指数，$ b $，表示占主导地位的统治力量。在这项工作中，我们在实验中探索了复杂流体的子类中的现象，即具有粒子流体动力相互作用作为粘弹性的起源的胶体和非胶体悬浮液。我们的观察结果表明，这种流体在剪切流中具有有限的弹性，但在延伸流中可以忽略不计。基于这些，该研究将牛顿的普遍性$ b = 0.5 $扩展到这些变薄的液体。此外，我们通过采用Ostwald-de Waele构成定律开发的理论模型来强化这些观察。最后，我们利用这种理论模型来检查广义牛顿流体中被捕的结合的存在。
Coalescence event in pendant and sessile drop is distinguished by the formation and evolution of the liquid bridge created upon singular contact. The bridge radius, $R$, is known to evolve as $R\sim t^b$, with power-law exponent, $b$, signifying the dominant governing forces. In this work, we experimentally explore the phenomenon in sub-classes of complex fluids namely, colloidal and non-colloidal suspensions that have particle hydrodynamic interactions as origin of viscoelasticity. Our observations suggest that such fluids have flow dependent thinning response with finite elasticity in shear flows but negligible in extensional flows. Based on these, the study extends the Newtonian universality of $b=0.5$ to these thinning fluids. Further we fortify these observations through a theoretical model developed by employing Ostwald-de Waele constitutive law. Finally, we utilize this theoretical model to inspect the existence of arrested coalescence in generalized Newtonian fluids.
