| 袁方洋， 于伟， 俞建峰， 崔政伟.螺旋静态混合器内气泡破碎的数值研究[J].轻工机械,2020,38(2):13-17 |
| 螺旋静态混合器内气泡破碎的数值研究 |
| Numerical Study on Bubble Breakup in Spiral Static Mixer |
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| DOI：10.3969/j.issn.1005 2895.2020.02.003 |
| 中文关键词: 螺旋静态混合器 群平衡方程 气泡分布 湍流剪切 |
| 英文关键词:spiral static mixer population balance equation bubble distribution turbulent shear |
| 基金项目:国家自然科学基金青年项目(11802105)；江苏省绿色过程装备重点实验室开放课题(GPE201705)。 |
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| 中文摘要: |
| 为了探究一种无挡板的螺旋型静态混合器内气泡破碎的机理，课题组构建群平衡模型并求解了螺旋静态混合器内的气泡群及液体的两相流动;研究了装置中的气泡运动和尺寸分布规律。结果表明：螺旋静态混合器中气泡在螺旋结构的流道中会发生破碎，与实验结果一致；气泡破碎主要由连续台阶流动形成的强水动剪切造成的，气泡直径变化随台阶高度的增加而变大，但达到一定值后增强作用不再变化；气泡的平均直径沿径向呈钟形分布，并且随着流动发展越来越小。螺旋静态混合器能增强气液相间的混合。 |
| 英文摘要: |
| In order to explore the mechanism of bubble breakage in a spiral static mixer without baffle, a group equilibrium model was constructed. The two phase flow of bubble groups and liquids in a spiral static mixer were solved. The bubble evolution and size distribution in the device were studied. The results show that the bubbles in the spiral static mixer break into smaller size through the spiral runner which is consistent with the result of experiments. Bubble breakage is mainly caused by strong hydrodynamic shear formed by continuous step flow, and the change of bubble diameter increases with the increase of the step height, but the enhancement will not change after reaching a certain value. The average diameter of the bubbles is distributed in a bell shape in the radial direction and becomes smaller as the flow develops. The spiral static mixer enhances mixing between the gas and liquid phases. |
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