Distribution of void fraction, ohmic resistance and current in a tall vertical gas-evolving cell
Distribution of void fraction, ohmic resistance and current in a tall vertical gas-evolving cell
复制标题
高立式气体演化电池中空隙率、欧姆电阻和电流的分布
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
G. Visser
中科院分区：
文献类型：
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作者：
L. Janssen;G. Visser
具有窄电极间隙的垂直电解槽用于产生气体，例如，Glzl Hz和Oz.溶液中的气体空隙率随着电解槽中高度的增加而增加，因此预期电流密度随着高度的增加而降低。阻抗和电流分布实验在具有两个电极（每个电极由20个相等的段组成）或具有分段电极和单板电极的未分隔的电池中进行。已经发现，对于泡状流，溶液的欧姆电阻增加，并且电流密度随着槽中高度的增加而线性地减小。已经提出了一个关系描述的空隙率在溶液中作为一个功能的空隙率和气泡层的厚度都在电极的前缘和空隙率在大部分的溶液。电流分配系数随平均电流密度的增大、液体体积流量的减小和阴阳极间距的减小而增大。此外，它的结论是，在电极表面积的变化保持无气泡的增加在电池中的高度几乎没有影响的电流分布因子。
Vertical electrolysers with a narrow electrode gap are used to produce gases, e.q. Glzl Hz and Oz. The gas voidage in the solution increases with increasing height in the electrolyser and consequently the current density is expected to decrease with increasing height. Impedance and current distribution experiments were carried out in an undivided cell with two electrodes each consisting of 20 equal segments or with a segmented electrode and a one-plate electrode. It has been found that for a bubbly flow the ohmic resistance of the solution increases and the current density decreases linearly with increasing height in the cell. A relation has been presented describing the voidage in the solution as a function of the voidage and the thickness of the bubble layer both at the leading edge of the electrode and the voidage in the bulk of solution. The current distribution factor increases with increasing average current density, decreasing volumetric flow rate of liquid and decreasing distance between the anode and the cathode. Moreover, it is concluded that the change in the electrode surface area remaining free of bubbles with increasing height in the cell has practically no effect on the current distribution factor.