微尺度驻停气泡柔性气-液界面抗流体剪切能力

Resistance to Fluid Flow Shear of the Micro-scale Standing Air Bubble Flexible Gas-Liquid Interface

在微流控系统中,稳定、可控的柔性气-液界面可实现声流体颗粒富集、微纳操作、快速气-液反应等各种实际物理和生化应用.微流道内气-液界面的抗流体剪切能力对于增强微尺度下气-液界面的可控性具有十分重要的意义.为此,文章研究了具有高稳定性、高可控性、可阵列化的微尺度驻停气泡现象.利用嵌入局部裂隙的微流道以及与之平行的气体流道,可对驻停气泡的生成和形态进行有效调节,并利用其可控的气-液界面实现多种功能化应用.在此基础上,文章进一步研究柔性可控气-液界面的抗流体剪切能力,对形态变化中的气-液界面受力进行分析,利用仿真和实验手段研究不同状态下气-液界面的形状特征,研究不同的液体驱动压力、裂隙尺寸以及裂隙形状对气-液界面抗剪切能力的影响,并将界面的曲率半径作为气泡驻留与否的判定依据.文章对驻停气泡柔性气-液界面抗流体剪切能力的研究有助于优化其控制方法,增强其控制稳定性并拓展其潜在应用场合.

In the microfluidic system,the controllable and flexible gas-liquid interface can realize various practical physical and biochemical applications such as acoustic-streaming particle concentration,micro-manipulation,and rapid gas-liquid reaction.The resistance to fluid shear of the gas-liquid interface in the microchannel is of great significance for enhancing the controllability of the gas-liquid interface at the microscale.Therefore,this paper studied the micro-scale stationary bubble phenomenon with high stability,controllability and array ability.Using a simple microfluidic special structure,the ge-neration and shape of the standing air bubble can be effectively adjusted,and the controllable gas-liquid interface can be functionalized.The resistance to fluid shear of the flexible controllable gas-liquid interface was discussed in this essay,as well as the analysis of the gas-liquid interface forces during morphological changes.The shape and characteristics of the gas-liquid interface under different conditions were studied by simulation and experimental methods.The effects of different li-quid driving pressures,crevice sizes and shapes on the gas-liquid interface were also studied in this paper.The radius of curvature of the interface is used as the basis for determining the stability of the bubble.The study on the resistance to fluid shear of the flexible gas-liquid interface of the standing air bubble helps to further optimize its control method,enhance its control stability and expand its potential applications.