Two-phase (water and air) flow in the forced-air mechanically-stirred Dorr-Oliver machine has been investigated using computational fluid dynamics (CFD). A 6 m3 model is considered. The flow is modeled by the Euler-Euler approach, and transport equations are solved using software ANSYS-CFX5. Unsteady simulations are conducted in a 180-degree sector with periodic boundary conditions. Air is injected into the rotor at the rate of 2.63 m3/min, and a uniform bubble diameter is specified. The effects of bubble diameter on velocity field and air volume fraction are determined by conducting simulations for three diameters of 0.5, 1.0, and 2.0 mm. Air volume fraction contours, velocity profiles, and turbulent kinetic energy profiles in different parts of the machine are presented and discussed. Results have been compared to experimental data, and good agreement is obtained for the mean velocity and turbulent kinetic energy profiles in the rotor-stator gap and in the jet region outside stator blades.
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机译：使用计算流体力学（CFD）研究了强制空气机械搅拌的Dorr-Oliver机器中的两相（水和空气）流动。考虑一个6 m 3 模型。用Euler-Euler方法对流进行建模，并使用软件ANSYS-CFX5求解运输方程。不稳定的模拟是在具有周期性边界条件的180度扇区中进行的。空气以2.63 m 3 / min的速度注入到转子中，并指定了均匀的气泡直径。气泡直径对速度场和空气体积分数的影响是通过对0.5、1.0和2.0 mm三种直径进行模拟来确定的。介绍并讨论了机器不同部分的风量分数等值线，速度曲线和湍动能曲线。将结果与实验数据进行了比较，并且在转子-定子间隙和定子叶片外部射流区域的平均速度和湍动能分布得到了很好的一致性。
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