Filtering microfluidic bubble trains at a symmetric junction
Filtering microfluidic bubble trains at a symmetric junction
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DOI：
10.1039/c1lc20639g
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发表时间：
2012-01-01
期刊：
影响因子：
6.1
通讯作者：
Khan, Saif A.
中科院分区：
文献类型：
--
作者：
Parthiban, Pravien;Khan, Saif A.
我们报告了如何使用名义上对称的微流体连接将即将到来的火车的所有气泡专门分类到其一个臂中。鉴于连接点是对称的，这种“过滤”机制的存在是出乎意料的。我们通过量化气泡如何调节微通道中的流体动力学阻力来分析这种行为，并展示如何在保持其空间周期性的同时加速气泡列，从而在名义上对称的连接处实现过滤。我们进一步展示了如何通过确定流动阻力随着微通道中气泡数量的增加而减小的条件，在对称几何形状中触发气泡列的这种不对称流量，并得出预测相同情况的精确标准。
We report how a nominally symmetric microfluidic junction can be used to sort all bubbles of an incoming train exclusively into one of its arms. The existence of this "filter" regime is unexpected, given that the junction is symmetric. We analyze this behavior by quantifying how bubbles modulate the hydrodynamic resistance in microchannels and show how speeding up a bubble train whilst preserving its spatial periodicity can lead to filtering at a nominally symmetric junction. We further show how such an asymmetric traffic of bubble trains can be triggered in symmetric geometries by identifying conditions wherein the resistance to flow decreases with an increase in the number of bubbles in the microchannel and derive an exact criterion to predict the same.