Effect of gas evolution on current distribution and ohmic resistance in a vertical cell under forced convection conditions
Effect of gas evolution on current distribution and ohmic resistance in a vertical cell under forced convection conditions
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强制对流条件下垂直电池中气体逸出对电流分布和欧姆电阻的影响
DOI：
10.1007/bf01006856
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发表时间：
1986
影响因子：
2.9
通讯作者：
H. Matsuda
中科院分区：
文献类型：
--
作者：
Y. Nishiki;K. Aoki;K. Tokuda;H. Matsuda
在具有分离器的垂直池中气泡的体积分数基于Bruggemann方程通过考虑当不含气泡的新鲜溶液以恒定速度供应到池底部时上升气泡的速度增加来评估。这种速度的提高是由于在工作电极处产生的气体体积的增加。考虑了工作电极处的超电位的以下三种情况：无超电位、线性型超电位和Butler-Volmer型超电位。在单元顶部的体积分数εh表示为单元的无量纲高度和动力学参数的函数。电池总电阻可表示为{（2/5εh）[1-εh）-3/2 - 1+εhD;]+μ}<$1d1/wh，其中<$1为无气泡溶液的电阻率，d1为极间距离，w为电池宽度，h为电池高度，μ为涉及隔膜过电位和电阻的参数。结果表明，极间距离存在一个最佳值。最佳值约为恒定气体上升速度情况下的值的四分之一，这对应于封闭系统。
The volume fraction of gas bubbles in a vertical cell with a separator was evaluated on the basis of the Bruggemann equation by taking into account the increase in velocity of the rising gas bubbles when fresh solution without gas bubbles is supplied to the bottom of the cell at constant velocity. This enhancement of the velocity results from an increase in the volume of gases evolving at the working electrode. The following three cases for overpotential at the working electrode were considered: no overpotential, overpotential of the linear type and of the Butler-Volmer type. The volume fraction, εh, at the top of the cell was expressed as a function of the dimensionless height of the cell and kinetic parameters. The total cell resistance can be expressed by {(2/5εh)[1−εh)−3/2−1+εhD;]+µ}ϱ1d1/wh, where ϱ1is the resistivity of the solution without gas bubbles,d1the interelectrode distance,wthe cell width,hthe cell height and μ the parameter involving overpotential and resistance of the separator. It was found that there is an optimum value of the interelectrode distance. The optimum value is about a quarter of the value for the case of constant gas rise velocity, which corresponds to a closed system.