文献类型：期刊文献

英文题名：A dynamic bridging criterion for sustained directional liquid transport in biomimetic open grooves under continuous injection

作者：Song, Siduo[1];Wang, Zhiwen[1];Zhang, Weijie[1];Huang, Qinhai[1];Yan, Xinyan[1];Song, Yuejia[1];Zhao, Danqi[1];Hong, Qiyang[1];Ma, Likun[1];Bai, Zhishan[1]

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

年份：2026

卷号：547

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20263421328875);Scopus(收录号：2-s2.0-105047535435);WOS:【SCI-EXPANDED(收录号:WOS:001854202700001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (No. 22308105), the National Science Fund for Distinguished Young Scholars, China (No. 22225804), the Shanghai Pujiang Program (No. 24PJD023), the Innovation Program of Shanghai Municipal Education Commission (2023ZKZD38), College Students'Innovative Entrepreneurial Training Plan Program (No. 202510251066).

语种：英文

外文关键词：Directional liquid transport; Biomimetic groove; Meniscus model; Dynamic bridging criterion; Continuous injection

摘要：Directional liquid transport on bioinspired structured surfaces is of broad interest for interfacial manipulation, open microfluidics, and passive fluid control. Inspired by the contour of scale-like units inPlatycladus orientalisbranchlets, we designed a millimeter-scale biomimetic groove with periodic synapse-like subunits and investigated its ability to sustain directional liquid transport under continuous injection. Despite extensive reports of directional transport on bioinspired interfaces, a quantitative criterion for sustained transport in continuously fed millimeter-scale grooves has not yet been established. Experiments were performed by varying the synapse angle (15-75 degrees) and injection rate (0.1-1.5 mu L/s), revealing a distinct transport window in theQ-theta space. Stable directional transport occurred only at intermediate angles (30-60 degrees) and moderate flow rates (0.1-1.0 mu L/s), whereas excessively small or large angles, as well as overfeeding conditions, led to weak rectification or overflow-induced failure. To interpret these behaviors, a gravity-inclusive meniscus model was developed to predict the critical liquid morphology and the bottom bridge coordinate. The predicted meniscus profiles agreed well with CFD simulations, with low root-mean-square errors on the order of 10(-2) mm for representative geometries. On this basis, a dimensionless dynamic bridging parameter, Lambda, was introduced to quantify the transition from local filling to continuous bridging during continuous injection. Lambda < 1 corresponds to a non-bridged state, Lambda approximate to 1 marks the critical onset of bridging, and Lambda > 1 indicates that the local geometric requirement for cross-unit bridging has been satisfied. The present work provides a physically interpretable and quantitatively validated indicator for local bridging onset during groove-confined, quasi-static propagation under continuous feeding.