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Study of mean diameter and drop size distribution of emulsion drops in a modified rotating disc contactor for an emulsion liquid membrane system

机译：乳液液膜系统改性旋转盘接触器中乳液下降的平均直径分布研究

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摘要

To improve the dispersity of the emulsion phase in an emulsion liquid membrane (ELM) system, a modified rotating disc contactor (MRDC) was developed. Then, the Sauter mean diameter (d32) of emulsion drops and their drop size distribution were measured by photographic method and analyzed by an image processing program in MATLAB. The effects of rotating speed, flow ratio, total flow, stirring paddle width and surfactant concentration on the drop size and its distribution were studied. The results show that, with the increase in the rotating speed and the paddle width, the degree of turbulence was enhanced which led to the reduction in the drop size. Meanwhile, membrane breakage increased with the turbulent fluctuation, which resulted in the leakage of the internal phase. Fortunately, the membrane breakage could be prevented by a suitable increase in the surfactant concentration. In addition, the drop size decreased with the increase in the surfactant concentration. Besides, the increase in the emulsion phase flow obviously increased the drop size, whereas the increase in the continuous phase flow induced the entrainment of small drops. An empirical correlation for the prediction of the d32 was established with an average absolute relative error (AARE) of 4.1%. The drop size distribution based on the drop volume was accurately fitted with a normal distribution, and its probability density function parameters (α and α) were well predicted by the dimensionless correlations, with the AAREs of 4.2% and 5.9%, respectively.
机译：为了改善乳液液膜（ELM）系统中乳液相的分散性，开发了改进的旋转盘接触器（MRDC）。然后，通过摄影方法测量乳液滴的燃烧器平均直径（D32）及其滴定尺寸分布，并通过Matlab中的图像处理程序分析。研究了旋转速度，流量比，总流动，搅拌焊盘宽度和表面活性剂浓度对下降尺寸及其分布的影响。结果表明，随着旋转速度和桨叶宽度的增加，湍流的程度得到了增强，其导致降低滴尺寸。同时，膜断裂随着湍流波动而增加，导致内部相的泄漏。幸运的是，可以通过合适的表面活性剂浓度的增加来防止膜断裂。另外，随着表面活性剂浓度的增加，滴尺寸降低。此外，乳液相流的增加明显增加了跌落尺寸，而连续相流的增加诱导小滴的夹带。建立了对D32预测的经验相关性，其平均绝对相对误差（AARE）为4.1％。基于下降体积的折叠尺寸分布精确配合，具有正态分布，其概率密度函数参数（α和α）通过无量纲相关性预测，AARS分别为4.2％和5.9％。

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  • 来源
    《RSC Advances》 |2015年第109期|共12页
  • 作者

    Lelin Zeng; Yi Zhang; Caroline Bukirwa;

  • 作者单位

    School of Chemical Engineering Xiangtan University Xiangtan City Hunan 411105 PR China.;

    School of Chemical Engineering Xiangtan University Xiangtan City Hunan 411105 PR China.;

    School of Chemical Engineering Xiangtan University Xiangtan City Hunan 411105 PR China.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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