Numerical simulation of junction point pressure during droplet formation in a microfluidic T-junction
Numerical simulation of junction point pressure during droplet formation in a microfluidic T-junction
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微流控 T 形接头中液滴形成过程中接头点压力的数值模拟
DOI：
10.1016/j.ces.2012.08.055
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发表时间：
2012-12
影响因子：
4.7
通讯作者：
Wen, Shizhu.
中科院分区：
文献类型：
--
作者：
Yan, Ying;Guo, Dan;Wen, Shizhu.
对微流控T型接头内液滴形成过程进行了三维数值模拟。采用水平集方法（LSM）对不混溶液/液T型连接系统中液滴的形成机理进行了数值模拟研究。研究了液滴的各种流动形态，如长段塞、小球、稳定流和最终的平行流，这些形态通常被称为挤压、滴下和喷射状态。此外，还讨论了挤压与滴注之间的过渡区以及平行流区。在微通道内液滴形成过程中，结合点的压力是波动的，它能准确、直观地反映微通道内的流态。模拟结果表明，在液滴形成过程中，挤压、滴注和喷射三种工况下的结合点压力分布都发生了变化。对液滴形成过程中结合点处的压力变化规律进行了研究，结果表明，结合点处压力波动的频率与新液滴形成的频率相同。此外，还分析了不同的分散相与表面的接触角和不同的毛细管数（Ca）的交界处的压力，以探讨液滴的形成机理。不同区域的压力幅值和周期各不相同。在相同流速下，滴状流态、挤压流态、喷射流态和平行流态的压力幅值大小顺序为：滴状流态、挤压流态、喷射流态和平行流态。
A three dimensional numerical simulation on the droplet formation in a microfluidic T-junction is reported. The mechanism of droplet formation in the immiscible liquid/liquid T-junction system has been studied numerically with the Level Set Method (LSM). Various droplet flow patterns such as long slugs, small spheres, stable stream and finally parallel flow are investigated, which are conventionally called squeezing, dripping and jetting regimes correspondingly. Apart from those, the transition regime between squeezing and dripping as well as parallel flow regime are also discussed. The pressure of the junction point fluctuated in the droplet formation process and it can reflect the flow pattern in the microchannel exactly and directly. The simulation results show that the pressure profiles of the junction point in the squeezing, dripping and jetting regimes change during the droplet formation process. New insights on the pressure of the junction point during the droplet formation process are provided and the results show that the frequency of the pressure fluctuation is the same as that of new droplet formation. In addition, the pressure of the junction of different contact angles of the dispersed phase with the surface and different capillary numbers (Ca) are also analyzed for investigating the droplet formation mechanism. The amplitudes and periods of the pressure in different regimes differ from each other. At the same flow velocity, the amplitudes of the pressure in dripping regime, squeezing regime, jetting regime and parallel flow regime ranks in the descending order.
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影响因子：
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