文献类型：期刊文献

英文题名：Coalescence dynamics of sessile and pendant droplets on fibers and mechanisms of secondary droplet formation

作者：Zhang, Yan[1];Huang, Qinghai;Yan, Xinyan[1];Song, Yuejia[1];Wang, Zhiwen[1];Lu, Zhaojin[1];Zhang, Lian[1];Yang, Hang[1];Ma, Likun[1];Bai, Zhishan[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：20

期号：4

外文期刊名：ENGINEERING CHEMICAL ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001688381700001)】；

基金：This work was supported by the National Key R&D Program of China (Grant No. 2024YFC3013500), the National Science Fund for Distinguished Young Scholars of China (Grant No. 22225804), the National Natural Science Foundation of China (Grant No. 22308105), the Shanghai Pujiang Program (Grant No. 24PJD023), and the Shanghai Postdoctoral Excellence Program (Grnat No. 2023244).

语种：英文

外文关键词：asymmetric droplet coalescence; sessile-pendant droplets; coalescence dynamics; secondary droplet; Mask R-CNN

摘要：As a cost-effective oil-water separation technology, fiber coalescers rely on a thorough understanding of the droplet coalescence mechanism. However, current research has primarily focused on the single process of sessile-sessile droplet coalescence. Using high-speed imaging and the mask region-based convolutional neural network, this study provided the first quantitative characterization of the complete dynamics of asymmetric pendant-sessile droplet coalescence, a phenomenon more prevalent in industrial settings. It was discovered that this process comprises three stages. In the liquid bridge formation stage (Stage I), the lateral expansion of the liquid bridge was dominated by the capillary pressure difference, and the influence of sessile-to-pendant droplet radius ratios on this process was negligible. The oscillation decay stage (Stage II) exhibited the uniqueness of the asymmetric system, where fiber adhesion accelerated energy dissipation, leading to rapid oscillation decay, while the amplitude of the capillary wave on the pendant droplet side was significantly enhanced with an increasing the size ratio. Ultimately, in the stable morphology formation stage (Stage III), increasing the size ratio to 1.5 could significantly reduce the size of the secondary droplets. These findings provided direct strategies for reducing polydisperse secondary droplets in industrial coalescers and enhancing separation efficiency.