On the measurement of gas holdup distribution near the region of impeller in a gas–liquid stirred Rushton tank by means of γ-CT
On the measurement of gas holdup distribution near the region of impeller in a gas–liquid stirred Rushton tank by means of γ-CT
复制标题
γ-CT测量气液搅拌Rushton罐叶轮附近含气率分布
DOI：
10.1016/j.cej.2012.02.023
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发表时间：
2012-04
影响因子：
15.1
通讯作者：
Milorad P. Dudukovic
中科院分区：
文献类型：
--
作者：
Li'na Kong;Wei Li;Luchang Han;Yuejin Liu;Hen'an Luo;Muthanna Al Dahhan;Milorad P. Dudukovic
在实验观察的基础上，确定了Rushton气液搅拌槽内溢流、加载和完全回流三种流型。气液体系由空气和水组成。采用γ-CT扫描法测量了在不同气体流量和叶轮转速条件下，叶轮附近区域的气含率分布。得到了定量的气含率数字分布曲线和定性的彩色CT图像。在叶轮区域，气含率分布在径向和轴向均出现一个凸形特征峰，随着该区域逐渐远离叶轮，气含率分布变得平缓。S33区的气含率略高于L33区。在轴向高度较高的区域，较高的叶轮转速对气含率的增加有一定的影响。实验测量结果与Bombaum先前发表的结果基本一致。分布器开孔数和孔径对气含率分布影响不大，分布器安装高度对气含率分布影响较大。当分布器安装在靠近Rushton槽底部的位置时，可以得到一个比较平滑的气含率分布。本文的研究结果有助于更好地了解Rushton槽叶轮附近区域的气含率分布，也可为CFD模拟提供实验数据。
Three flow patterns of flooding, loading and complete recirculation in a gas–liquid stirred Rushton tank were identified based on experimental observation. The gas–liquid system was composed of air and water. Under different operating conditions of gas flow rate and impeller rotating speed, the distribution of gas holdup near the region of impeller was measured using a γ-CT scan method. Both quantitative digital distribution curves of gas holdup and their qualitative color CT images were obtained. At the region of impeller, there was a convex characteristic peak of gas holdup distribution both in radial and in axial directions, and with the region being gradually away from the impeller, the distribution of gas holdup became flatter. The values of gas holdup in S33 regime were a little higher than those in L33 regime. Higher impeller rotating speed had some effect on the increasing of gas holdup at the region of higher axial height. The experimental measurement results were basically consistent with those previously published by Bombač. The hole number and diameter of sparger had little influence on the distribution of gas holdup, while the sparger's installed height had significant influence on them. When the sparger was installed close to the bottom of Rushton tank, a comparatively smoother distribution of gas holdup above the space of impeller could be obtained. The research results in this paper were useful for better understanding of gas holdup distribution near the region of impeller of Rushton tank, and could also provide experimental data for CFD simulation.
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影响因子：
15.1
作者：
Bombac, A;Zun, I
通讯作者：
Zun, I
影响因子：
4.7
作者：
A. Bombač;I. Zun
通讯作者：
A. Bombač;I. Zun
影响因子：
2.4
作者：
D. Toye;M. Crine;P. Marchot
通讯作者：
D. Toye;M. Crine;P. Marchot
DOI：
10.1016/s0255-2701(00)00147-1
发表时间：
2001-11
期刊：
Chemical Engineering and Processing
影响因子：
--
作者：
Zhengming Gao;J. Smith;H. Müller-Steinhagen
通讯作者：
Zhengming Gao;J. Smith;H. Müller-Steinhagen
影响因子：
4.2
作者：
A. Khopkar;S. Panaskar;A. B. Pandit;V. Ranade
通讯作者：
A. Khopkar;S. Panaskar;A. B. Pandit;V. Ranade