Numerical modelling of three-phase cavitation flows through venturi

Eriez浮选事业部(EFD)是Eriez制造有限公司的全资子公司，除了为**采矿和矿物加工行业提供**喷雾和柱状浮选设备外，还提供**先进的测试和工程服务。EFD工程师设计了一种新型文丘里-CavTube®，它**用于产生超细气泡以及颗粒和气泡之间的强烈接触，以浮选**疏水矿物。CavTube®上的压力降对于操作喷雾和柱状浮选设备至关重要，例如，压降决定了所需的泵负荷(例如，能量输入)。在这种观点下，需要**准确预测不同流入条件下的压降：浆料组成和空气喷射速率**，以优化CavTube®的操作参数设计。在这项工作中，Ansys-Fluent CFD软件中提供的所谓**基于欧拉的三相模型将被用于**模拟文丘里的空化现象。利用二维和三维CFD模拟的结果，我们开发并**验证了一个简化的半经验模型，该模型将用于**预测文丘里管内的压降**依赖于进气参数，如空气喷射位置、固相体积分数和**文丘里管内的几何形状。在基于二维和三维CFD的多相模拟的基础上，将开发一种新的先进的半经验**模型来估计不同注气方案下的工作压降。该项目的成果将是开发和验证一个先进的半经验模型，以预测**压降依赖于流量、泥浆成分和空气注入速率。对Venturis内部多相流中的空化进行建模的预期结果**将显著有助于在加拿大各地的不同选矿技术**中有效实施新的工程Venturi的决策**。

Eriez Flotation Division (EFD), which is a wholly owned subsidiary of Eriez Manufacturing Co, provides**advanced testing and engineering services in addition to sparging and column flotation equipment for the**mining and minerals processing industries. EFD engineers have designed a new venturi - CavTube®, which is**used to produce ultra-fine bubbles and intense contacting of particles and bubbles for a flotation of**hydrophobic minerals. The pressure drop across the CavTube® is critical for operating sparging and column**flotation equipment, e.g. pressure drop determines the required pump duty (e.g., energy input). In this view, an**accurate prediction of the pressure drop for different inflow conditions: slurry composition and air injection**rate is needed for the optimal design of operating parameters for CavTube®. In this work, the so-called**three-phase Euler-Euler-Euler-based model available in Ansys-Fluent CFD software will be adapted to**simulate cavitation phenomena in venturi. Using the results of 2D and 3D CFD simulations we develop and**validate a simplified semi-empirical model which will be used to predict pressure drop in a venturi in**dependence on inflow parameters such as the location of air injection, volume fraction of solid phase and**venturi geometry. Based on 2D and 3D CFD-based multi-phase simulations A new advance semi-empirical**model will be developed to estimate the operating pressure drop for different air injection scenarios. The**outcome of this project will be development and validation of an advance semi-empirical model to predict**pressure drop in dependence on flow rate, a composition of slurry and air injection rate. The expected outcome**from the modeling the cavitation in multi-phase flows inside venturis will significantly contribute to decision**making on effective implementation of new engineered venturis in different mineral processing technologies**across Canada.