Analysis model of internal residence time distribution for fluid flow in a multi-strand continuous casting tundish  

作　　者：Qiang Yue Yue Li Zi-ming Wang Ben-chen Sun Xiu-zhen Wang 

机构地区：[1]School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan,243002,Anhui,China [2]School of Mechanical Engineering,Anhui University of Technology,Ma’anshan,243002,Anhui,China

出　　处：《Journal of Iron and Steel Research International》2024年第9期2186-2195,共10页钢铁研究学报（英文版）

基　　金：supported by grants from the National Natural Science Foundation of China(No.51774004);Anhui Province Outstanding Research and Innovation Team in Higher Education Institutions(No.2022AH010024).

摘　　要：The external residence time distribution(RTD)curve is extensively used to characterise fluid flow within the single-strand continuous casting tundish.Dead volume fraction determination typically relies on the external RTD curve to reveal macroscopic fluid flow behaviour.Based on the external RTD to effectively assess dead volume fractions and other fluid characteristics under conditions of internal non-uniform flow,an internal RTD was introduced.In a smooth pipe under laminar flow conditions,the dead region occupies 25%of the total volume,which is defined as the space between the pipe wall and a radius of 0.866 R0(where R0 is the radius of pipe).Under turbulent flow conditions,the dead region only occupies 0.38%of the reactor’s internal volume,spanning from the pipe wall to a radius of 0.00189 R0.The results obtained using the external RTD method are consistent with the theoretical analysis.Experimental trials involving water were conducted to examine the flow of molten steel within a five-strand tundish.Subsequently,an analysis approach employing internal RTD was employed to evaluate fluid mixing within a multi-flow continuous casting tundish.Using the internal RTD method,the analysis revealed that the whole dead zone volume fraction of the intermediate package decreased from 26.9%to 18.9%after the addition of the flow control device.The dead volume fraction can be accurately depicted by utilising the internal mean RTD function.The association between the internal RTD function and the external average RTD can be effectively employed to scrutinise the response curve of the tracer within a system exhibiting uneven flow distribution.

关 键 词：TUNDISH Internal residence time distribution Dead volume Critical velocity Mathematical modelling 

分 类 号：TF777[冶金工程—钢铁冶金]