论文标题
阐明施加乳化的机制
Elucidating the mechanism of step-emulsification
论文作者
论文摘要
步骤乳化微设备的三维，时间依赖性直接模拟突出了液滴形成的两个基本机制：首先，不良压力梯度的发作驱动从外部储层到微通道的连续相的反流。其次，流动射流的效果导致其随后的破裂。还表明，由于动态压力的稳定效果，这种破裂被延迟，并最终通过增加通道内分散相的流速而抑制。这提出了一个基于毛细管和韦伯数字的局部值，用于滴落喷射过渡的新标准。
Three-dimensional, time-dependent direct simulations of step emulsification micro-devices highlight two essential mechanisms for droplet formation: first, the onset of an adverse pressure gradient driving a back-flow of the continuous phase from the external reservoir to the micro-channel. Second, the striction of the flowing jet which leads to its subsequent rupture. It is also shown that such a rupture is delayed and eventually suppressed by increasing the flow speed of the dispersed phase within the channel, due to the stabilising effect of dynamic pressure. This suggests a new criterion for dripping-jetting transition, based on local values of the Capillary and Weber numbers.
