JSME International Journal Series B Fluids and Thermal Engineering
Online ISSN : 1347-5371
Print ISSN : 1340-8054
ISSN-L : 1340-8054
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Effects of Generated Bubbles Between Electrodes on Efficiency of Alkaline Water Electrolysis
Niro NAGAIMasanori TAKEUCHIMotohide NAKAO
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2003 Volume 46 Issue 4 Pages 549-556

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Abstract

There is an optimum condition on water electrolysis efficiency due to the effects of generated bubbles between electrodes. In this paper, in order to explain the existence of the optimum condition, a model of alkaline water electrolysis was established. The model can express void fraction and current density profiles along electrodes, and show the existence of the optimum condition. For verification of this model, rising velocity, diameter distribution of bubbles between electrodes and current density profiles along electrodes were measured during water electrolysis of KOH solution. Two-phase flows between electrodes were observed by a still camera and a digital video camera. The results showed that bubble rising velocity ranges from 4-24cm/s and becomes larger as current density increases. Bubble diameter ranges from 0.01-0.8mm, where average diameter becomes large as current density increases. Obtained results showed the sound validity of present model.

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© 2003 by The Japan Society of Mechanical Engineers
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