基于径向力平衡的鼓泡塔二维流体力学模型

2-D hydrodynamic model of bubble column based on lateral-force balance

提出了一种鼓泡塔二维轴对称流体力学模型，模型中将气泡所受的升力以及湍动扩散力作为形成塔内气含率稳定分布的主要机制。采用Fluent6．3流体力学软件求解模型，能得到稳定的二维流场，气含率与液速分布与实验值吻合良好，模型能准确反映表观气速（O．12～0．62m·s^-1）以及塔径（φ200mm、φ500m、φ800mm）对流型的影响。利用该模型对更大直径鼓泡塔的流动参数进行了预测，结果与文献给出的经验关联式相符。

A 2-D axisymmetric hydrodynamic model of bubble column was developed, by considering lift force and turbulent dispersion force on bubbles as main mechanism of stable distribution of gas holdup. A commercial code Fluent 6.3 was used for calculation, and the model gave a stable 2-D flow pattern, in which distributions of gas holdup and liquid velocity were in good agreement with experimental data. The model correctly demonstrated the influence of superficial gas velocity （0.12--0.62 m · s^-1） and column diameter （φ200 mm, φ500 mm, φ800 mm） on flow pattern. Furthermore, hydrodynamic variables predicted by the model in larger scale columns agreed with published empirical correlations.