γ-CT measurement and CFD simulation of cross section gas holdup distribution in a gas–liquid stirred standard Rushton tank
γ-CT measurement and CFD simulation of cross section gas holdup distribution in a gas–liquid stirred standard Rushton tank
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DOI：
10.1016/j.ces.2011.03.042
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发表时间：
2011-09
影响因子：
4.7
通讯作者：
Yuejin Liu;Wei Li;Luchang Han;Yang Cao;He’an Luo;M. Al-Dahhan;M. Duduković
中科院分区：
文献类型：
--
作者：
Yuejin Liu;Wei Li;Luchang Han;Yang Cao;He’an Luo;M. Al-Dahhan;M. Duduković
采用137 Cs γ-CT扫描测量技术，在大气体流量和高叶轮转速条件下，测量了气液搅拌标准Rushton槽内3/4无因次静止液高截面上的气含率分布。获得的CT扫描图像和基于CT图像的无因次半径的气含率数字分布曲线可以解释气含率分布的波动变化。气含率分布的密集区出现在叶轮叶片的上部空间。气含率随气体流量和搅拌桨转速的增加而增加，但气体流量对气含率的影响大于搅拌桨转速。采用欧拉-欧拉双流体模型耦合气泡聚并、破碎模型和阻力系数模型，对Rushton搅拌槽在不同气体流量和搅拌桨转速下的气含率分布进行了CFD模拟。
Cross section gas holdup distributions at 3/4 dimensionless static liquid height in a gas–liquid stirred standard Rushton tank were measured using137Cs γ-CT scan measuring technology at larger gas flow rates and higher impeller rotating speeds. The obtained CT scan images and digital distribution curves of gas holdup with dimensionless radius based on the CT images could explain the fluctuation changes of gas holdup distribution. The dense area of gas holdup distribution appeared in the upper space of impeller blades. Gas holdup increased both with gas flow rate and impeller rotating speed, but gas flow rate had more influence on gas holdup than impeller rotating speed. The Eulerian–Eulerian two-fluid model coupling with the bubbles' coalescence and break-up models, and the drag coefficient model were established to make CFD simulation of gas holdup distributions for the gas–liquid stirred Rushton tank under different gas flow rates and impeller rotating speeds.