基于液液非均相的离散相润湿性能影响分析

Analysis on Influence of Discrete Phase Wettability Based on Liquid-liquid Heterogeneity

多层斜板重力沉降分离器分离液液非均相物系过程中,离散相与接触壁面的润湿特性对分离效率有明显的影响。利用可视化与图像后处理技术,实验研究了水下环境中配比不同碘质量分数的CCl4油滴与3种常用板材的润湿性能。结果表明:聚甲基丙烯酸甲酯(PMMA)和不锈钢为水下亲油表面,玻璃为水下疏油表面。水下油滴含杂质质量分数相同的条件下,与玻璃表面的接触角较大,PMMA和不锈钢表面接触角接近。随着油滴含杂质质量分数的增加,水下油滴在PMMA表面的接触角增大,润湿时间增加;在玻璃表面接触角减小,润湿时间基本不变;3种材质表面滑动角均呈现减小趋势。该研究对液相环境下离散相油滴在壁面上润湿性能提供基础数据,为相关设备的选材和角度设计提供优化设计方案。

The wetting characteristics of the discrete phase and the contact wall have obvious influence on the separation efficiency in the process of separating liquid-liquid heterogeneous system with multilayer inclined plate gravity sedimentation separator.The wettability of CCl4 oil droplets with different iodine mass fractions and three common plates in underwater environment was experimentally studied by visualization and image post-processing technology.The results showed that PMMA(polymethyl methacrylate)and stainless steel were oil-philic surfaces under water,and glass was oil-phobic surface under water.Under the condition of the same impurity mass fraction,the contact angle between underwater oil droplets and glass surface was large,and the contact angle between PMMA and stainless steel surface was close.With the increase of impurity mass fraction in oil droplets,the contact angle of underwater oil droplets on PMMA surface increased and the wetting time increased.The contact angle on the glass surface decreased,and the wetting time was basically unchanged.The surface sliding angles of the three materials all showed a decreasing trend.This study can provide basic data for the wetting performance of discrete phase oil droplets on the wall in liquid environment,and provide an optimal design scheme for the material selection and angle design of related equipment.