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

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外文摘要：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.

外文关键词：

TundishInternal residence time distributionDead volumeCritical velocityMathematical modelling

作者：

Qiang Yue、Yue Li、Zi-ming Wang、Ben-chen Sun、Xiu-zhen Wang

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作者单位：

School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,Anhui,China

School of Mechanical Engineering,Anhui University of Technology,Ma'anshan 243002,Anhui,China

基金：

National Natural Science Foundation of ChinaAnhui Province Outstanding Research and Innovation Team in Higher Education Institutions

项目编号：

517740042022AH010024

出版年：

2024

DOI：

10.1007/s42243-024-01189-3

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

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影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(9)