Abstract In this study we present an investigation on the impact of sparger configuration and fluid properties on the local gas phase dynamics for up to 17% total gas holdup. Experiments in a bubble column with 100 mm inner diameter were conducted with deionized water and NaOH solution of up to cNaOH = 32 mmol·l−1. Ultrafast X-ray computed tomography (UFXCT) was applied to obtain local hydrodynamic parameters, such as gas holdup distribution, bubble sizes and average bubble rise velocities. Radial gas holdup profiles show wall peaking, which is attributed to the uniform bubbly flow regime generated by the needle sparger used in this study. The addition of NaOH leads to similar gas holdup values but significant changes on local bubbly dynamics, such as bubble size distribution and axial gas phase velocity. The Sauter mean diameter was found to decrease with increasing concentration of NaOH, whereby the decrease is larger at higher gas flow rate.

中文翻译：

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在均匀气泡流动条件下，用去离子水和 NaOH 溶液操作的实验室规模气泡塔中气相动力学的实验分析

摘要 在这项研究中，我们研究了喷雾器配置和流体特性对局部气相动力学的影响，总含气率高达 17%。在内径为 100 mm 的鼓泡塔中，使用去离子水和高达 cNaOH = 32 mmol·l-1 的 NaOH 溶液进行实验。应用超快 X 射线计算机断层扫描 (UFXCT) 来获取局部流体动力学参数，例如含气率分布、气泡大小和平均气泡上升速度。径向气体滞留率曲线显示壁峰，这归因于本研究中使用的针状分布器产生的均匀气泡流动状态。添加 NaOH 会导致类似的气体滞留率值，但会显着改变局部气泡动力学，例如气泡尺寸分布和轴向气相速度。