Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow.
Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow.
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DOI：
10.1103/physrevlett.117.028002
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发表时间：
2016-07
影响因子：
8.6
通讯作者：
G. Dumazer;B. Sandnes;M. Ayaz;K. Måløy;E. Flekkøy
中科院分区：
文献类型：
--
作者：
G. Dumazer;B. Sandnes;M. Ayaz;K. Måløy;E. Flekkøy
我们实验研究的流动和图案的颗粒悬浮液内的空气取代狭窄的管道。侵入的空气-液体界面积聚颗粒状材料的塞，该塞由于与限制壁的摩擦而堵塞管。当气体压力超过颗粒的孔隙毛细管入口压力时，气体通过静态塞运移，并在塞的远侧重新建立移动聚集前缘。这一过程不断重复，使得前进的界面在其尾流中留下一串堵塞物。此外，我们表明，该系统经历了流化过渡和完全排空的颗粒悬浮液时，液体的提取率增加超过一个临界值。颗粒堆积的稳定性条件的分析模型预测流态。
We study experimentally the flow and patterning of a granular suspension displaced by air inside a narrow tube. The invading air-liquid interface accumulates a plug of granular material that clogs the tube due to friction with the confining walls. The gas percolates through the static plug once the gas pressure exceeds the pore capillary entry pressure of the packed grains, and a moving accumulation front is reestablished at the far side of the plug. The process repeats, such that the advancing interface leaves a trail of plugs in its wake. Further, we show that the system undergoes a fluidization transition-and complete evacuation of the granular suspension-when the liquid withdrawal rate increases beyond a critical value. An analytical model of the stability condition for the granular accumulation predicts the flow regime.