论文标题
随机喷射和滴入密闭的软颗粒流中
Stochastic jetting and dripping in confined soft granular flows
论文作者
论文摘要
我们报告了密封的软颗粒流中的新动态模式，例如随机喷射和滴水，在连续粘性流体中没有对应物。由于单个晶粒的混乱行为的传播，新模式出现了 - 在这里，随着乳液通过外部粘性流将乳液聚焦到狭窄的孔口中，单分散乳液液滴到整个系统的水平。我们观察到雪崩动力学和非常稳定的喷气机的形成 - 单file颗粒链 - 偶尔会破裂，导致簇尺寸的非高斯分布。我们发现，导致这种链形成的液滴重排的序列类似于狭窄的毛细血管中癌细胞簇的展开，总的来说，微流体乳液系统可以用来建模软颗粒流的各个方面，包括在中间尺度上的组织动力学。
We report new dynamical modes in confined soft granular flows, such as stochastic jetting and dripping, with no counterpart in continuum viscous fluids. The new modes emerge as a result of the propagation of the chaotic behaviour of individual grains -- here, monodisperse emulsion droplets to the level of the entire system as the emulsion is focused into a narrow orifice by an external viscous flow. We observe avalanching dynamics and the formation of remarkably stable jets -- singlefile granular chains -- which occasionally break, resulting in a non-Gaussian distribution of cluster sizes. We find that the sequences of droplet rearrangements that lead to the formation of such chains resemble unfolding of cancer cell clusters in narrow capillaries, overall demonstrating that microfluidic emulsion systems could serve to model various aspects of soft granular flows, including also tissue dynamics at the meso-scale.
