电解水产生氢气泡尺度分布的测量

为了便捷地测量出电解水产生的氢气泡场的尺度分布,提出了一种利用显微照相、微气泡图像处理和统计分析技术的方法。首先通过显微照相系统拍摄同一区域不同时刻电解水产生的氢气泡图像;然后采用图像增强、分割、形态学处理、颗粒测量等手段获取每张图像中微气泡的数量和尺度;最后利用测量区域内微气泡数量变化的平稳随机特性,用测量区域内微气泡在时间轴上的统计尺度分布特性代替空间特性,获得氢气泡在整个气泡生成空间的尺度分布。结果表明,3种电解电流密度条件下,电解水产生氢气泡的尺度分布基本符合高斯分布,平方相关系数大于0.95;且电解电流越大,气泡尺度分布越分散;但电解电流的大小对氢气泡的平均尺度的影响不明显。该方法可有效地测量电解水产生氢气泡的尺度分布。

Measurement of size distribution of hydrogen-bubbles in water electrolysis

A method for conveniently measuring the size distribution of hydrogen-bubbles in water electrolysis was presented based on micrograph, image proceeding and statistical analysis. Firstly, pictures of hydrogen-bubbles produced by water electrolysis in the same space and at different time were taken by an optical microscopy apparatus. Secondly, image enhancement, image segmentation, morphological transformation and particle measurements were adopted to get number and size micro-bubbles in each picture. Finally, based on ergodicity of the amount of micro-bubbles in measuring space, the size distribution of bubbles in the whole bubble-producing space was obtained by substituting statistical size distribution in time sequence for spatial size distribution. The experimental results show that the hydrogen-bubbles' size distribution in water electrolysis quite fits Gaussian function and the square correlative coefficients are all beyond 0.95 under three electrolytic currents, and the larger electrolytic current is, the more dispersive the size distribution is, but the influence of electrolytic current on average size of hydrogen-bubbles is little. Analysis and experiment make sure that the presented method can measure the size distribution effectively.