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

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.