Numerical Simulation of Molten Jet Breakup by Coupled Multiphase Model Based on VOF Method and Two-Fluid Model

Current study couples the interface tracking model based on VOF with the two-fluid model in a unified solution framework.The new model can simulate the complex multiphase flow in which large-length-scale interface and small-length scale interface coexist.The model is a three-fluid,eight-equation model.For momentum fields,the fluid is divided into continuous phase and dispersed phase.Interface of continuous phase is tracked by VOF/PLIC method.Surface area distribution of the dispersed phase is simulated by the area transport equation.Governing equations of the new model is solved by MCBA-SIMPLE algorithm.The coupled model is applied to molten jet flow and breakup simulation.Experimental observation is used for comparison and validation.Effects of jet breakup model and initial drop diameter are also discussed in this paper.Results indicate that the original jet breakup model overestimates the jet penetration length,and the initial drop diameter affects the coolability of the melt significantly.