| Channel induction heating tundish can heat the molten steel to compensate the loss of heat due to heat exchange with ambient,while the electromagnetic force generated by induction can promote the removal rate of inclusions in the molten steel to purify the liquid,thus attracting more and more researchers' attention.Although some related research' results shown that the different size parameters of the channel have a great influence on the heating efficiency and the removal effect of the tundish.However,these researches are not sufficiently concrete,therefore,it is still necessary to study the impacts of heating channel installation position and geometric parameters.In this paper,a research focus on the flow field and temperature field of the double-channel-type induction heating tundish is carried out by mathematical method,which employing a variety of software and using the multi-physical field coupling method.SolidWorks,a commercial software,is used to complete 3D models,ICEM-CFD module of Ansys is introduced to create mesh file.Through the commercial software Maxwell,the solving of Joule heat and electromagnetic force of tundish is carried out,and their results are coupled to Fluent by directly method and writing UDF file respectively,during the solving process for flow field and temperature field as well as RTD curve in Fluent.The research contents include: Influence of different physical field,influence of different heating channel position,influence of different channel length and transversal-section radius and shape of induction heating channel.The accuracy of numerical simulation results is verified according to the experimental results of hydraulics model.According to Experimental and Mathematical results which indicated that the simulated results of flow pattern in tundish of these two models are matching quite well.The average value of the relative error of both RTD curves is 9.5%.It shows that the simulated parameters and assumptions for mathematical simulation are accurate and reliable.According to the numerical simulation results for each distance which between heating channel and the tunish bottom as 325 mm,275 mm,225 mm,175 mm and 125 mm,can obtained that the scheme with 325 mm of distance is the best one,the average residence time of the scheme is 434.0 s,and its inclusion removal rate as well as the ratio between plug flow and dead zone are both maximum values,are 47.1% and 7.9 respectively,so the distance scheme of 325 mm is the best.The research results of 1483 mm,1383 mm,1283 mm,1183 mm,and 1083 mm as specified values for heating channel length indicated that the 1483 mm of channel length possesses the longest average residence time,434.0 s,and the maximum values of shortest response time and the volume fraction of plug flow were appeared as well,while the volume fraction of dead zone of it is the minimum one,the scheme also has the highest induction heating efficiency and maximum inclusion removal rate.So the length scheme 1483 mm is the best.According to the research results of the induction heating channel's transversal shape(as rectangular,hexagon,octagon and round respectively),found that optimum values for the average residence time,434.0 s,shortest response time,16.0 s and the ratio between plug flow and dead zone,7.9,are existed in round transversal shape of heating channel,and its heating efficiency as well as its inclusion removal rate are also the highest.So choosing round shape as transversal shape of induction heating channel is the best choice.According to the results of the studies of 45 mm,60 mm,75 mm,90 mm,and 105 mm as the radius of transversal section of induction heating channel,obtaining that the radius as 105 mm possesses the longest average residence time,448.0 S,and its value of the ratio between plug flow and dead zone as well as its inclusions removal rate are better than others',are 11.7 and 57.1%,respectively.So 105 mm is a reasonable value for the radius of transversal-section of induction heating channel.The results of present work provide a theoretical guidance for the design and improvement of continuous casting tundish,and lays a theoretical foundation for the application popularization of induction heating tundish in metallurgical industry. |
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