Numerical Simulation of Collision-Coalescence and Removal of Inclusion in Tundish with Channel Type Induction Heating

Abstract

Numerical simulation is an effective tool to analyze the inclusion behavior in the tundish with channel induction heating. And the inclusion mass/population conservation model is applied to predict and describe inclusion physical field. Due to the channel induction heating, Archimedes slipping velocity and Archimedes collision are applied to describe the inclusion behavior in the tundish with channel induction heating. The predicted values agree with the experimental data for the inclusion model. Numerical results show that Joule heat and electromagnetic force can prompt the inclusion removal rate. Compared with Joule heat, electromagnetic force is a more important factor to affect the inclusion's movement and Archimedes collision is also one of the important collision mechanisms for inclusion coalescence. The inclusion removal rate in the channels is up to one third of the inclusion removal rate in the tundish, and the inclusion removal rate in the tundish increases from 21.4% to 35.05% if channel induction heating is applied.

Numerical Investigation of Flow Characteristics of Molten Steel in the Tundish with Channel Induction Heating

“…The assumptions for electromagnetic field, flow and heat transfer in the tundish with channel induction heating have already been published in previous papers [32,34,35]. The current model is applied for the present work.…”

“…The domain was divided into 300,318 hexahedral cells. During iteration, the convergence was assumed to reach a point where all the normalized residuals are smaller than 10 −6 [32,35].…”

“…The model validation about fluid flow, temperature field, electromagnetic force and inclusion field can be found in previous papers [32,34,35]. The experimental device of the water model is also described in the paper [35].…”

“…For the tundish with channel type induction heating, due to its convenient heating function, excellent stirring effect and novel structure in modern metallurgical industry, an increasing number of steel mills have carried out industrial production. Research on a multi-physical field (electromagnetic field, flow field, temperature field and inclusion field) has been investigated in recent years [29][30][31][32][33][34][35][36][37]. So far, the detailed flow behavior of the fluid in the channel-type induction heating tundish is still a vague concept, which the unknown plug volume, dead volume and mixed volume in the receiving chamber, channel and discharging chamber.…”

Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid

“…Based on this perspective, many numerical and experimental studies on non-metallic inclusion removal have been carried out covering an induction furnace, 1,2) gas stirring in a ladle, 3,4) RH degassing 5,6) and a continuous casting tundish [7][8][9][10][11][12] and mold, 13) among others. As a pioneering work in this field, Lindborg and Torssell 14) applied a population balance model 15) of inclusion growth and removal to explain their experimental study.…”