Generation of microbubbles via a tapered capillary
Generation of microbubbles via a tapered capillary
复制标题
DOI：
10.1063/5.0173926
复制
发表时间：
2023-12
影响因子：
4.6
通讯作者：
Wei Lu;Er-Qiang Li;Peng Gao
中科院分区：
文献类型：
--
作者：
Wei Lu;Er-Qiang Li;Peng Gao
我们提出了一种新的方法，用于有效地生产微泡的基础上，锥形毛细管与一个adherorly附着的细丝。当毛细管内发生气液两相驱替时，气锥在毛细管口附近破裂。当适当选择压力时，所产生的微泡可以被推出毛细管并由液体罐收集。在毛细管的直线部分采用液柱，其可以维持毛细管孔口附近的液膜，从而通过沿细丝沿着输送液体来维持气泡的产生。在工作压力范围内，增加输入空气压力导致微泡直径减小。微泡的最小直径近似等于锥形毛细管的孔口直径。在我们的实验中，可以实现最小直径为1.56 μm的微泡。从理论上推导了描述锥形管内气液界面演化的一维非定常润滑方程。气泡夹断是合理的润滑方程的数值解。特别是，预测的气泡直径与实验测量一致。
We propose a novel method for efficient production of microbubbles based on a tapered capillary with an interiorly attached filament. When gas–liquid displacement driven by an input pressure occurs in the capillary, the gas cone ruptures close to the orifice of the capillary. The generated microbubbles can be pushed out of the capillary and collected by a liquid tank when the pressure is appropriately selected. A liquid column is employed in the straight part of the capillary, which can sustain the liquid film near the capillary orifice and hence the bubble generation by transporting liquid along the filament. Within the working pressure range, increasing the input air pressure leads to a decrease in the microbubble diameter. The minimum diameter of the microbubbles is approximately equal to the orifice diameter of the tapered capillary. In our experiments, microbubbles with a minimum diameter of 1.56 μm can be realized. Theoretically, we derive a one-dimensional unsteady lubrication equation describing the evolution of the gas–liquid interface in a tapered tube. The bubble pinch-off is justified by the numerical solution of the lubrication equation. In particular, the predicted bubble diameters are in agreement with the experimental measurements.