论文标题
剪切流中气泡迁移的实验和数值研究：可变形性链链和排斥
Experimental and numerical investigation of bubble migration in shear flow: deformability-driven chaining and repulsion
论文作者
论文摘要
我们研究了剪切流中气泡的相互作用诱导的迁移，并观察到悬浮在弹性肿瘤乳液中的气泡组织成在流动方向上排列的链，类似于粘弹性流体中的颗粒。为了研究驾驶机制，我们使用具有不同流变学特性的悬浮液在气泡对上进行实验和模拟。首先，我们注意到，对于所有流体，相互作用类型取决于气泡的相对位置。如果它们朝着涡度方向排列，则它们会击退，如果没有，它们会互相吸引。只要毛细血管数足够大，模拟在牛顿流体中显示出与粘弹性和弹性塑料流体相似的行为。这表明气泡的相互作用相关迁移受气泡变形的强烈影响。我们认为，迁移的原因是由于毛细管压力，迁移的原因是变形气泡周围的异质压力场之间的相互作用。
We study the interaction-induced migration of bubbles in shear flow and observe that bubbles suspended in elastoviscoplastic emulsions organise into chains aligned in the flow direction, similarly to particles in viscoelastic fluids. To investigate the driving mechanism, we perform experiments and simulations on bubble pairs, using suspending fluids with different rheological properties. First, we notice that, for all fluids, the interaction type depends on the relative position of the bubbles. If they are aligned in the vorticity direction, they repel, if not, they attract each other. The simulations show a similar behavior in Newtonian fluids as in viscoelastic and elastoviscoplastic fluids, as long as the capillary number is sufficiently large. This shows that the interaction-related migration of the bubbles is strongly affected by the bubble deformation. We suggest that the cause of migration is the interaction between the heterogeneous pressure fields around the deformed bubbles, due to capillary pressure.
