基于群体平衡模型的旋流萃取元件的数值模拟

发布时间：2018-08-24 08:24

【摘要】：以旋流萃取元件为研究对象,建立了物理模型,通过流体分析软件ANSYS 15.0对液液两相流场进行数值模拟。选用群体平衡模型,考虑液滴的破碎、聚并,通过加载源项考虑相间的传质行为。研究结果表明,随着计算时间的推移,分散相的索特直径分布从Log-Normal初始化分布到小液滴占多数、再到大液滴的较均匀分布,可作为分析萃取过程的方法之一。在处理量一定的情况下,随着被萃取组分含量的增大,萃取率也相应增大;在被萃取组分的含量一定的情况下,萃取率随连续相流速的增大呈先增大后减小的趋势,过大的流速使得两相没有足够的接触时间,导致萃取率降低。本研究可为进一步认识群体平衡模型模拟液滴行为以及液-液分散过程提供一定的指导。
[Abstract]:A physical model was established to simulate the liquid-liquid two-phase flow field by the fluid analysis software ANSYS 15.0. The mass transfer behavior of each phase is considered by loading the source term, considering the breakage and aggregation of droplets. The results show that with the passage of calculation time, the solder diameter distribution of dispersed phase can be used as one of the methods to analyze the extraction process, from the initial distribution of Log-Normal to the distribution of small droplets, and then to the uniform distribution of large droplets. The extraction rate increases with the increase of the content of the extracted component, and the extraction rate increases first and then decreases with the increase of the flow rate of the continuous phase. The excessive flow rate leads to insufficient contact time for the two phases, leading to a decrease in the extraction rate. This study can provide some guidance for further understanding the population equilibrium model to simulate the droplet behavior and the liquid-liquid dispersion process.
【作者单位】：常州大学机械工程学院江苏省绿色过程装备重点实验室;
【基金】：江苏省研究生科研创新计划项目(KYZZ16_0247)
【分类号】：TQ028.32

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