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运用计算流体动力学和群体平衡模型相结合(CFD-PBM)的方法对振荡流反应器内液-液两相流进行CFD模拟。模拟结果表明,反应器内平均流速随振荡雷诺数的增大而增加,而且是最大振荡速度的(1.1～1.2)倍;分散相的体积分率随振荡雷诺数的增大基本不变。利用群体平衡模型得到了分散相液滴的粒径分布及其平均粒径,随着振荡雷诺数的增大,粒径小的液滴在分散相中所占的体积分率越来越大,液滴的平均粒径逐渐减小;在相同的振荡雷诺数下,振幅比频率对液滴粒径的影响更大,更有利于液滴间的破碎。通过得到的流场信息和液滴平均粒径可以预测两相间的传质特性,为反应器的设计、结构改进和优化提供理论依据。
CFD-PBM was used to simulate the liquid-liquid two-phase flow in the oscillatory flow reactor by using the CFD-PBM method. The simulation results show that the average flow rate increases with the increase of oscillating Reynolds number and is 1.1 ~ 1.2 times of the maximum oscillation speed. The volume fraction of dispersed phase does not change with the increase of Reynolds number. The particle size distribution and the average particle size of dispersed droplets were obtained by the population equilibrium model. With the increase of the oscillating Reynolds number, the volume fraction of droplets with smaller particle size in the dispersed phase became larger and larger, The average particle size of the droplets gradually decreases; at the same oscillating Reynolds number, the amplitude of the droplet diameter than the greater impact on the size, more conducive to the breakdown between droplets. The mass transfer characteristics between two phases can be predicted through the obtained flow field information and the average particle size of the droplets, providing a theoretical basis for the design, structure improvement and optimization of the reactor.