T形微通道中微细气泡生成过程数值模拟及其影响因素分析

Numerical Simulation of Microbubble Formation in T-junction Microchannel and Analysis of Its Influencing Factors

微细气泡因其具有尺寸小、上升速度慢和传质效率高等特点,在污水处理、超声成像和皮肤清洁等领域具有可观的潜在应用价值。以微流控方法生成微细气泡为研究对象,针对T形微流道中气、液二相流体相互作用机制,开展基于COMSOL的微细气泡生成特性数值模拟研究,观测不同时刻下的微细气泡的形态特征,分析气体压强、液体流量、气体通道宽度、混合界面润湿性等因素对微细气泡生成特性的影响规律,并研制T形微流控芯片,通过微细气泡生成特性测试系统开展试验验证,为微细气泡定量精准可控生成提供仿真与试验依据。

Due to the characteristic of small size,slow rising speed and high mass transfer efficiency,microbubbles have considerable potential application value in wastewater treatment,ultrasound imaging,skin cleaning and other fields.Focus on the interaction mechanism of gas-liquid two-phase fluid in T-junction microchannel,this paper takes the microfluidic method based microbubble formation as the research object.The numerical simulation of microbubble formation based on COMSOL is carried out.The morphological features of microbubbles at different times are observed.The influence of gas pressure,liquid flow,gas channel width and wettability of mixed interface on the generation characteristics of microbubbles is analyzed.T-type microfluidic chip is developed to verify the accuracy of simulation trend by microbubble generation characteristics test system.The result of this research would provide simulative and experimental basis for quantitative and accurate generation of microbubbles.