Effect of interphase mass transfer on droplet coalescence in agitated liquid–liquid dispersions

IF 4.3 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2025-09-22 DOI:10.1016/j.ces.2025.122656

Yubin Cai , Han Zhou , Zhongshu Yang , Shan Jing , Wenjie Lan , Shaowei Li

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引用次数: 0

Abstract

Interphase mass transfer is widely recognized as a pivotal driver of droplet coalescence in multi-phase reactors, yet its governing principles have remained unquantified until now. In this study, we directly measured droplet coalescence efficiency in a mixing tank by systematically varying solute species, concentration gradients, mass-transfer directions, and interfacial mass-transfer flux. The experimental results indicate that the coalescence efficiency decreases when the solute is added for two-phase system in equilibrium state. Mass transfer inhibits coalescence when the direction is C → D (continuous phase to dispersed phase), while opposite direction promotes coalescence, and the promoting effect is larger for larger mass transfer flux. The dimensionless number MaPe was introduced to construct modified coalescence efficiency models based on the model in our previous work. The modified coalescence models agreed well with experimental results under mass transfer conditions.

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搅拌液-液分散体中相间传质对液滴聚结的影响

相间传质被广泛认为是多相反应器中液滴聚结的关键驱动因素，但其控制原理至今仍未被量化。在本研究中，我们通过系统地改变溶质种类、浓度梯度、传质方向和界面传质通量，直接测量了混合槽中液滴的聚结效率。实验结果表明，在平衡态的两相体系中，加入溶质会降低聚结效率。当传质方向为C → D（连续相到分散相）时，传质抑制聚结，反之则促进聚结，且传质通量越大，促进作用越大。在前人研究的基础上，引入无因次数MaPe来构建改进的聚结效率模型。在传质条件下，修正的聚结模型与实验结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.