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CFD-PBM simulation of hydrodynamics of microbubble column with shear-thinning fluid
International Journal of Chemical Reactor Engineering ( IF 1.6 ) Pub Date : 2021-02-01 , DOI: 10.1515/ijcre-2020-0172
Xi Zhang 1 , Ping Zhu 1 , Shuaichao Li 1 , Wenyuan Fan 1 , Jingyan Lian 1
Affiliation  

A numerical simulation was performed to study the hydrodynamics of micro-bubble swarm in bubble column with polyacrylamide (PAM) aqueous solution by using computational fluid dynamics coupled with population balance models (CFD-PBM). By considering rheological characteristics of fluid, this approach was able to accurately predict the features of bubble swarm, and validated by comparing with the experimental results. The gas holdup, turbulent kinetic energy and liquid velocity of bubble column have been elucidated by considering the influences of superficial gas velocity and gas distributor size respectively. The results show that with the rise of the superficial gas velocity, the gas holdup and its peak width increase significantly. Especially, the curve peak corresponding to high gas velocity tends to drift obviously toward the right side. Except for the occurrence of a smooth holdup peak at the column center under the condition of the moderate distributor size, the gas holdups for the small and large distributor sizes become flat in the radial direction respectively. The distribution of turbulent kinetic energy presents an increasingly asymmetrical feature in the radial direction and also its variation amplitude enhances obviously with the rise of gas velocity. The increase in gas distributor size can enhance markedly turbulent kinetic energy as well as its overall influenced width. At the low and moderate superficial gas velocity, the curves of the liquid velocity in radial direction present the Gaussian distributions, whereas the perfect distribution always is broken in the symmetry for high gas velocity. Both liquid velocities around the bubble column center and the ones near both column walls go up consistently with the gas distributor size, especially near the walls at the large distributor size condition.

中文翻译:

剪切稀化流体对微泡塔水动力学的CFD-PBM模拟

通过计算流体动力学和种群平衡模型(CFD-PBM)进行了数值模拟,研究了聚丙烯酰胺(PAM)水溶液中气泡塔中微气泡群的流体动力学。通过考虑流体的流变特性,该方法能够准确预测气泡群的特征,并与实验结果进行了比较。通过分别考虑表观气速和气体分布器尺寸的影响,阐明了鼓泡塔的持气量,湍动能和液速。结果表明,随着表观气体速度的增加,气体的持留量及其峰值宽度显着增加。特别地,对应于高气体速度的曲线峰趋于明显向右侧漂移。除了在中等分布器尺寸的情况下在塔中心出现一个平稳的滞留峰外,小和大分布器尺寸的气体滞留率分别在径向上变得平坦。湍动能的分布在径向上呈现出越来越不对称的特征,并且其变化幅度随着气体速度的增加而明显增加。气体分配器尺寸的增加可以显着增强湍动能及其整体影响的宽度。在较低和中等的表观气体速度下,径向上的液体速度曲线呈现高斯分布,而对于高气体速度,理想状态下的分布总是对称的。
更新日期:2021-03-16
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