Liu Cheng-Lin, Sun Ze, Lu Gui-Min, Yu Jian-Guo
National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology, Shanghai, People's Republic of China.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, People's Republic of China.
R Soc Open Sci. 2018 May 2;5(5):171255. doi: 10.1098/rsos.171255. eCollection 2018 May.
Gas-evolving vertical electrode system is a typical electrochemical industrial reactor. Gas bubbles are released from the surfaces of the anode and affect the electrolyte flow pattern and even the cell performance. In the current work, the hydrodynamics induced by the air bubbles in a cold model was experimentally and numerically investigated. Particle image velocimetry and volumetric three-component velocimetry techniques were applied to experimentally visualize the hydrodynamics characteristics and flow fields in a two-dimensional (2D) plane and a three-dimensional (3D) space, respectively. Measurements were performed at different gas rates. Furthermore, the corresponding mathematical model was developed under identical conditions for the qualitative and quantitative analyses. The experimental measurements were compared with the numerical results based on the mathematical model. The study of the time-averaged flow field, three velocity components, instantaneous velocity and turbulent intensity indicate that the numerical model qualitatively reproduces liquid motion. The 3D model predictions capture the flow behaviour more accurately than the 2D model in this study.
析氢垂直电极系统是一种典型的电化学工业反应器。气泡从阳极表面释放出来，会影响电解液的流动模式，甚至影响电池性能。在当前的工作中，对冷模型中气泡引起的流体动力学进行了实验和数值研究。分别应用粒子图像测速技术和体积三分量测速技术，在二维平面和三维空间中实验可视化流体动力学特性和流场。在不同气体流量下进行了测量。此外，在相同条件下建立了相应的数学模型，用于定性和定量分析。将实验测量结果与基于数学模型的数值结果进行了比较。对时间平均流场、三个速度分量、瞬时速度和湍流强度的研究表明，数值模型定性地再现了液体运动。在本研究中，三维模型预测比二维模型更准确地捕捉了流动行为。
