A Numerical Simulation for the Initial Filling in Continuous Casting Tundish and Its Experimental Verification

• Main Authors: Lin, Li-Chuan, 林麗娟
• Other Authors: Hwang Weng-Sing
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/81757591241171804282

碩士 === 國立成功大學 === 材料科學(工程)學系 === 86 === Abstract The fluid flow phenomena during the initial filling of a tundish in the continuous casting process is closely related to the entrapment of gas and slag in the molten steel as well as the erosion of the refractory. The purpose of this study is to develop a mathematical model to simulate this fluid flow phenomena .The information provided by the analysis has proven to be useful to optimize the tundish design to reduce the entrapment of gas in the molten steel as well as the erosion of the refractory and to be consulted to eliminate the second steel during the end of initial tundish filling .In the initial stage of developing the mathematical system﹐the basis and reliability of the mathematical model is verified by conducting water model experiments and comparing the numerically simulated flow patterns with the water model observations. The mathematical model is based on a computational fluid dynamics technique; named SOLA-MAC, which has the capabilities of handing transient fluid flow phenomena with highly and quickly distorted free surfaces. An air particle technique is also incorporated to clearly and explicitly reveal the extent of gas entrapment . For water model experiments , high speed photography is employed to record the quick changes of the free surface during the tundish filling . The main result of the study is to develop a mathematical model to simulate the fluid pattern of initial tundish filling. For the filling operation of tundish , We also study the effects of the inlet velocity and volume of the second steel before formal casting . The fluid pattern and the entrapment of gas on the initial tundish filling can control by the inlet velocity conditions. Lower the filling rates on the open timing of the outlet are ,more the reducing rates of the second steel are. The results of the study show the optimal operating conditions of the initial tundish filling can obtain cleaner continuous casting steel.