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arXiv 1504.01439physics.flu-dyn
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微流控Hele-Shaw池中锚定液滴的破碎

Breaking anchored droplets in a microfluidic Hele-Shaw cell

Gabriel Amselem, P. T. Brun, François Gallaire, Charles N. Baroud

摘要:

我们研究了Hele-Shaw细胞中的微流体自数字化,使用固定在表面张力陷阱上的煎饼液滴。我们发现,在临界流速以上,大锚定液滴破裂,形成两个女儿液滴,其中一个仍然在锚。在临界流速以下,锚定液滴的形状由取决于外部流体的毛细数的弹性方程给出。当速度超过临界值时,方程不再允许满足边界条件的解;尽管颈部仍然具有有限的宽度,但液滴破裂。类似的断裂事件也发生在锚阵列的孔之间,我们使用锚阵列来原位产生静止液滴的2D阵列。

英文摘要:

We study microfluidic self digitization in Hele-Shaw cells using pancake droplets anchored to surface tension traps. We show that above a critical flow rate, large anchored droplets break up to form two daughter droplets, one of which remains in the anchor. Below the critical flow velocity for breakup the shape of the anchored drop is given by an elastica equation that depends on the capillary number of the outer fluid. As the velocity crosses the critical value, the equation stops admitting a solution that satisfies the boundary conditions; the drop breaks up in spite of the neck still having finite width. A similar breaking event also takes place between the holes of an array of anchors, which we use to produce a 2D array of stationary drops in situ.

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