文献类型：期刊文献

英文题名：Experimental and theoretical study on the gas holdup feature in a 1.5-m tall alkaline water electrolytic cell

作者：Zhang, Hao[1];Zhang, Run[1];Chen, Zhengjun[1];Yuan, Fang[1];Yang, Qiang[1];Liu, Bo[1]

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

年份：2025

卷号：71

期号：6

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20251218060459);WOS:【SCI-EXPANDED(收录号:WOS:001484688900025)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 22178099, 52025103), the Shanghai Natural Science Foundation (21ZR1417000), the Research and Development of Key Technologies and Equipment for Carbon Capture and Mass Transfer Enhancement in Flue Gas of One Million Tons/Year (2022YFE0130000), and the Hydrogen Energy Green Manufacturing and Utilisation Key Core Technology Integration and Research Platform.

语种：英文

外文关键词：alkaline electrolytic cell; current density; gas holdup; gas-liquid two-phase flow

摘要：Gas-liquid two-phase flow in alkaline water electrolysis critically influences current density and efficiency, yet quantitative insights remain limited. This work examines gas holdup and bubble size distribution in a custom-designed 1.5-m high-electrolytic cell, mimicking an industrial press-filter design. Results reveal that gas holdup increases with cell height and current density due to cumulative gas production, while higher electrolyte flow velocity reduces holdup by accelerating bubble transport. The average electrolytic bubble size d43 evolves significantly from ~100 mu m near the bottom to ~300 mu m at the top of the cell, driven by coalescence and influenced by electrolysis current. A one-dimensional drift-flux model identified cell height, current density, electrolyte circulation rate, and bubble size as critical determinants of gas holdup. Theoretical predictions demonstrate that increasing d43 from 130 to 270 mu m can halve gas holdup, highlighting bubble size regulation as a key strategy for reducing gas holdup to enhance electrolyzer performance.