文献类型：期刊文献

英文题名：EXPERIMENTAL AND NUMERICAL INVESTIGATION OF TWO-PHASE FLOW PATTERNS IN MAGNESIUM ELECTROLYSIS CELL WITH NON-UNIFORM CURRENT DENSITY DISTRIBUTION

作者：Liu, Cheng-Lin[1];Sun, Ze[1];Lu, Gui-Min[1];Song, Xing-Fu[1];Yu, Jian-Guo[1]

机构：[1]E China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China

年份：2015

卷号：93

期号：3

起止页码：565

外文期刊名：CANADIAN JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20150800540044);WOS:【SCI-EXPANDED(收录号:WOS:000349983600012)】；

基金：The authors acknowledge the financial support provided by the National Natural Science Foundation of China (Grant 21206038), the Specialized Research Fund for the Doctoral Program of Higher Education (New Teachers) (Grant 20120074120014), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：computational fluid dynamics; current density distribution; magnesium electrolysis cell; particle image velocimetry; two-phase flow

摘要：In a magnesium electrolysis cell, the electrolyte flow pattern can be affected by the chlorine gas bubbles release from the anodes. A 2D gas-liquid mathematical model was developed to simulate the liquid velocity and gas volume fraction. A Particle Image Velocimetry (PIV) experimental set-up was employed to determine the characteristics of velocity field in a cold model and to validate the mathematical model. The numerical results show good agreement with the experimental data. The local production rate of gas evolution is related to the anode current density according to Faraday's law. To make the bubble generation close to the reality, the non-uniform current density distribution over the anode surfaces, derived from the thermoelectric model, has been added to the gas-liquid model as initial boundary conditions. According to the analysis, the use of non-uniform conditions is necessary. The flow patterns in the side channels are found to be quite different from that in the middle channels, where the velocity is much lower. It is noted that both current intensity and bubble size can significantly affect the velocity field and gas volume fraction distributions. The velocity can be increased with higher current intensities and larger bubble size, and the gas volume fraction can be enhanced with higher current intensities and lower bubble diameters. Additionally, the liquid velocity will decrease sharply when the bubble diameter smaller than the critical value (0.9mm). It is better to keep the bubble diameter larger than the critical size for the electrolyte circulation.