INVESTIGATION OF FLOW BEHAVIOUR AND INCLUSION REMOVAL MECHANISM IN A MULTI -STRAND TUNDISH WITH STRAND BLOCKAGES

Abstract

In the continuous casting of steel, the tundish is basically an intermediate vessel placed between the ladle and the mould so as to distribute and supply liquid steel to different moulds at an approximately constant rate. In recent years, with continuing emphasis on superior steel quality, the tundish has become more of a continuous reactor than merely a distribution vessel. Thus a modern day steel making tundish is designed to provide maximum opportunity for carrying out various metallurgical operations such as inclusion separation, inclusion floatation, alloy trimming of steel, and thermal and chemical homogenization. In present study, numerical investigation of transient fluid phenomenon in delta tundish has been carried out. Mathematical modeling of fluid flow and transport phenomena are validated against physical model and results indicate that a reasonably accurate mathematical framework now exists for effective tundish analysis. In mathematical modeling, the turbulent Navier—Stokes equations are solved to predict the flow velocity distributions. The present study was done to investigate effect of transient flow on to the temperature of molten steel inside a bare tundish and tundish with APB. Geometry of tundish were made by using GAMBIT software and numerical solution of 3D Navier-Stokes equation are being carried on software package FLUENT. It was found that blockage of outlets of tundish due to inclusion particles, increases, the mean residence time of molten steel. In this work seven outlet clogging conditions have been studied. After validating with experimental setup, various cases have studied. These cases are made from various parameters like diameter of inclusion particles, density. Different solution model have used and each are compared. Heat transfer through tundish was also studied and thermal contour were produced for out planes.