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利用基于场介子格子Boltzman(LB)方法对T形微通道内油-水不互溶两相流动进行了数值模拟.通过静止液滴算例改进该两相流LB模型且验证了模型的有效性,成功数值模拟了T形微通道内油水两相流的五种不同流型.数值模拟结果和实验数据定性和定量吻合很好,表明本文数值方法的有效性.此外,采用改进后的LB两相流模型模拟了不同界面张力和接触角条件下的液滴形成过程,讨论了这两个变量对流型和液滴形状的影响.结果表明LB方法是研究微通道内不互溶两相流的一种有效的数值工具,能够对各种涉及不互溶多相流微流体设备的设计提供指导.
A two-phase flow LB model was modified by stationary droplet and the validity of the model was verified by using the meson lattice Boltzman (LB) method. Five different flow patterns of oil-water two-phase flow in a T-shaped microchannel were numerically simulated.The results of numerical simulation and experimental data agree well with each other to show the validity of the numerical method.In addition, The flow model simulates the formation of droplets under different interfacial tension and contact angle, and discusses the effects of these two variables on the flow pattern and droplet shape. The results show that the LB method is a new method to study the immiscible two-phase flow in the microchannel An effective numerical tool that provides guidance on a wide range of designs involving non-miscible multiphase flow microfluidic devices.