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

Journal of Iron and Steel Research International 2024年第9期31卷 2186-2195页

作者： Qiang Yue Yue Li Zi-ming Wang Ben-chen Sun Xiu-zhen Wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina School of Mechanical Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina

The external residence time distribution(RTD)curve is extensively used to characterise fluid flow within the single-strand continuous casting *** volume fraction determination typically relies on the external RTD curve to reveal macroscopic fluid flow *** 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 *** 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 *** results obtained using the external RTD method are consistent with the theoretical *** trials involving water were conducted to examine the flow of molten steel within a five-strand ***,an analysis approach employing internal RTD was employed to evaluate fluid mixing within a multi-flow continuous casting *** 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 *** dead volume fraction can be accurately depicted by utilising the internal mean RTD *** 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

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Numerical investigation of the effect of transitory strand opening on mixing in a multistrand tundish

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 535-542页

作者： Sabin Kumar Mishra Pradeep Kumar Jha Satish Chandra Sharma Satish Kumar Ajmani Department of Mechanical and Industrial Engineering Indian Institute of Technology RoorkeeRoorkee 247667UttarakhandIndia Steelmaking and Casting Research Group Tata SteelR&DBurma MinesJamshedpur 831007JharkhandIndia

In a multistrand,the outlet near the inlet produces short circuiting *** leads to the formation of dead zones inside the tundish,and consequently,the mean residence time *** the present study,numerical investigation of mixing inside a delta shaped tundish with sloping boundaries was carried out by solving the Navier-Stokes equation and employing the standard turbulence *** decrease the dead zone volume inside the tundish,the effect of closing the outlet near the inlet for a small amount of time and further opening it on the mixing behavior of the tundish was *** outlets near the inlet were closed for varying amount of time,and the transient analysis of fluid flow and the tracer dispersion study were carried out to find the mixing parameters of the tundish,namely,mean residence time and the ratio of mixed to dead volume of the *** optimum closure time of the near outlet has been found,which yields best mixing inside the *** numerical code was validated against the experimental observation by performing the tracer dispersion study inside a multistrand tundish and the reasonably good match between the experimental and numerical results in terms of residence time distribution （RTD） *** results obtained from the present study confirm the strong role of choosing the right time for opening and closing the outlets to get improved characteristics for the fluid flow and mixing behavior of the *** educational version of computational fluid dynamics （CFD） software PHOENICS was used to solve the governing equations and interpret the results in different forms.

关键词： continuous casting billets tundish flow simulation mean residence time dead volume computational fluid dynamics (CFD)

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