Numerical modelling of three-phase cavitation flows through venturi

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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.