Numerical Simulation on Gas-Liquid Two Phase Flow in Continuous Casting Tundish with Bottom Gas Blowing
底吹气连铸中间包内气液两相流的数值模拟

Gas-liquid two phase flow in a tundish has been studied with a water model, prototype of which is the one in Meishan Iron and Steel Corporation. Experimental results show that with bottom gas blowing, tiny, steady and uniformly distributed bubbles can be produced and bubbly flow pattern forms in the tundish, uprising bubbly flow can destroy the laminar-like flow in the tundish and enhance flow mixing, on the other hand, the uprising bubbles can form a baffle-like gas column, which is in favor of inclusion removal. Based on the experiments, an Eulerian multi-fluid model is used to simulate gas?liquid bubbly flow in the tundish, Sato model is incorporated to include bubble-induced turbulence, Grace model is used to model inter-phase drag force, buoyancy is considered with Boussinesq approximation, turbulence dispersion force is also included with the model of Lopez. Numerical results well agree with those from experiments.