The trapping and release of bubbles from a linear pore

The trapping and release of bubbles from a linear pore
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线性孔隙中气泡的捕获和释放

DOI:
10.1017/jfm.2013.103
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发表时间:
2013
影响因子:
3.7
通讯作者:
Dawson G
Dawson G
中科院分区:
工程技术2区
文献类型:
--
作者:
Dawson G

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从天然多孔介质流动到人造芯片实验室应用,容器几何形状的流向变化是许多实际感兴趣的多相流的一个特征。可变的流向几何形状通常会对气泡运动产生主要影响,并可能导致诸如管道堵塞之类的不良现象。在这里,我们研究了一种基本构型的堵塞,在这种构型中,一根方形截面的管子在短的流向距离上突然膨胀。恒定流量驱动下的气泡扩大到部分填充膨胀的程度取决于粘性应力和表面张力之间的平衡,由毛细管数测量,非单调地取决于气泡的大小。我们通过实验和毛细管静态模型验证,如果在捕集器长度上的压力功超过了被捕获的气泡重新进入狭窄的方形管所需的表面能,则气泡被释放。
Streamwise variation in vessel geometry is a feature of many multiphase flows of practical interest, ranging from natural porous media flows to man-made lab-on-the-chip applications. The variable streamwise geometry typically exerts a dominant influence on bubble motion, and can lead to undesirable phenomena such as clogging of the vessel. Here, we study clogging in a fundamental configuration, where a tube of square cross-section is suddenly expanded over a short streamwise distance. The extent to which a bubble driven by constant flux flow broadens to partially fill the expansion depends on the balance between viscous and surface tension stresses, measured by the capillary number depends non-monotonically on the size of the bubble. We verify, with experiments and a capillary static model, that a bubble is released if the work of the pressure forces over the length of the trap exceeds the surface energy required for the trapped bubble to reenter the constricted square tube.
DOI: 10.1063/1.3682772
发表时间: 2011-11
期刊: Physics of Fluids
影响因子: 4.6
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期刊: LAB ON A CHIP
影响因子: 6.1
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影响因子: 3.7
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通讯作者: DE LÓZAR A