Transport of wetting liquid plugs in bifurcating microfluidic channels
Transport of wetting liquid plugs in bifurcating microfluidic channels
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DOI：
10.1016/j.jcis.2006.12.018
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发表时间：
2007-04-01
影响因子：
9.9
通讯作者：
de Langre, Emmanuel
中科院分区：
文献类型：
--
作者：
Ody, Cedric P.;Baroud, Charles N.;de Langre, Emmanuel
在恒定压力下驱动润湿液塞通过微通道中的分叉。对于在直通道中前进的塞子，我们发现，在散装的粘性耗散可以使用Poiquille的法律估计，而Bretherton和坦纳的法律模型的额外的耗散发生在后方和前方接口。在第二阶段，我们专注于通过T型接头流动的塞子的行为。实验表明存在一个阈值压力，低于该阈值压力，塞子在连接处的入口处保持阻塞。超过这个所需的压力，塞子进入分叉，并破裂或分裂成两个子塞子，这取决于所施加的压力和塞子的初始长度。通过几何参数和前面引用的法律，我们提出了一个全球性的模型来预测之间的过渡观察到的行为。(c)2007爱思唯尔公司All rights reserved.
A plug of wetting liquid is driven at constant pressure through a bifurcation in a microchannel. For a plug advancing in a straight channel, we find that the viscous dissipation in the bulk may be estimated using Poiseuille's law while Bretherton and Tanner's laws model the additional dissipation occurring at the rear and front interfaces. At a second stage, we focus on the behavior of the plug flowing through a T-junction. Experiments show the existence of a threshold pressure, below which the plug remains blocked at the entrance of the junction. Above this required pressure, the plug enters the bifurcation and either ruptures or splits into two daughter plugs, depending on the applied pressure and on the initial length of the plug. By means of geometrical arguments and the previously cited laws, we propose a global model to predict the transitions between the three observed behaviors. (c) 2007 Elsevier Inc. All rights reserved.