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采用计算流体动力学方法对制备生物柴油的圆环挡板振荡流反应器的液-液两相流进行了数值模拟研究。选取欧拉-欧拉模型描述液-液两相流动,进一步耦合群体平衡模型将液滴的聚并和破裂考虑在内,对湍流模型则采用标准k-ε模型进行描述。在此基础上,对反应器的挡板开孔率和挡板间距等重要结构参数进行了优化。模拟结果表明,在振荡频率为4 Hz、振幅为16~36 mm条件下,通过混合效果、能量耗散和液滴直径分布等情况综合考虑,最适宜挡板开孔率范围为25%~30%,最适宜挡板间距为1.5D。
A computational fluid dynamics method was used to simulate the liquid-liquid two-phase flow in a ring baffle oscillating flow reactor for biodiesel production. The Euler-Euler model is chosen to describe the liquid-liquid two-phase flow, the coupled population equilibrium model is further taken into account for the aggregation and rupture of the droplets, and the standard k-ε model is used for the turbulence model. On this basis, the important structural parameters such as baffle opening ratio and baffle spacing of the reactor were optimized. The simulation results show that under the conditions of oscillation frequency of 4 Hz and amplitude of 16 ~ 36 mm, the optimum baffle aperture ratio is 25% ~ 30, considering the mixing effect, energy dissipation and droplet diameter distribution. %, The most appropriate baffle spacing of 1.5D.