Detailed measurements and computational fluid dynamics (CFD) investigation of the hydrodynamics in a bubble column containing internal features causing flow disturbances are presented for both air and helium gases. An optical needle probe has been used to measure profiles of bubble size, bubble velocity, and gas holdup at different locations across the cross section of the column. An approach combining CFD with population balances is able to represent observed multiphase flow phenomena such as the effect of the pipes to remix and redistribute the gas as well as the tendency of the gas to channel through a slit in the pipes rather than go around the pipes. The comparison of CFD simulation to experimental measurements reveal that the overall decrease in gas holdup observed when switching from air to helium gas can be explained by swarm effects, whereas the steeper decrease in the gas holdup profile across the column is due to coalescence effects. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3764–3774, 2018

中文翻译：

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预测气体密度对气泡流流体动力学的影响：通过结合人口平衡模型和计算流体动力学的方法获得的新见解

提出了对气泡塔的流体力学进行详细的测量和计算流体动力学（CFD）研究，该气泡塔包含对空气和氦气均造成流动干扰的内部特征。光学针探针已被用于测量整个柱截面上不同位置处的气泡大小，气泡速度和气体滞留量的分布图。将CFD与总体平衡相结合的方法能够表示观察到的多相流现象，例如管道重新混合和重新分配气体的效果以及气体通过管道中的缝隙而不是绕过管道的趋势。 。CFD模拟与实验测量结果的比较表明，从空气转换为氦气时观察到的整体气体滞留量下降可以通过群效应来解释，而整个色谱柱中气体滞留率曲线的急剧下降归因于聚结效应。©2018美国化学工程师学会AIChE J，64：3764-3774，2018