Interfacial tension is an essential physical property in two‐phase flow, and it changes due to the mass transfer. The measurement of dynamic interfacial tension (DIFT) in such a condition is a difficult problem. In the previous study (Zhou et al., Chem Eng Sci. 2019; 197:172–183), we presented the quantitative relation between the droplet breakup frequency function (DBFF) and interfacial tension. It is found that the DBFF is highly depended on interfacial tension. Therefore, the DBFF is a suitable parameter to quantitatively characterize the interfacial tension. Based on this concept, the DIFT in the column is determined by regression method after the DBFF under mass transfer condition is measured. It is found that the DIFT is smaller than the static interfacial tension. This result indicates that interphase mass transfer leads to decreasing of the interfacial tension. The decreasing extent of the DIFT has a positive correlation with the mass transfer flux.

中文翻译：

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传质条件下脉冲柱中动态界面张力的测定

界面张力是两相流中必不可少的物理性质，它会由于传质而变化。在这种条件下的动态界面张力（DIFT）的测量是一个难题。在之前的研究（Zhou等人，Chem Eng Sci。2019; 197：172–183）中，我们介绍了液滴破裂频率函数（DBFF）与界面张力之间的定量关系。发现DBFF高度依赖于界面张力。因此，DBFF是定量表征界面张力的合适参数。基于此概念，在测定传质条件下的DBFF后，通过回归法确定色谱柱中的DIFT。发现DIFT小于静态界面张力。该结果表明相间传质导致界面张力降低。DIFT的减小程度与传质通量呈正相关。