Analysis on Residence Time Distribution Curve of Continuous Casting Tundish by Combined Model. Issue 12 (25th June 2018)

• Record Type: Journal Article
• Authors: Su, Xiaofeng; Ji, Yilong; Liu, Jianhua; He, Yang; Shen, Shaobo; Cui, Heng
• Other Names: Zhang Lifeng guestEditor.
• Is Part Of: Steel research international. Volume 89:Issue 12(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-06-25
• Subjects: combined model -- dead volume -- plug flow -- residence time distribution curve -- well‐mixed flow; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201800085
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : Combined model in which a tundish is divided into plug flow, well‐mixed flow, and dead region has been widely used for the analysis of residence time distribution curve in an actual tundish. However, the calculation of dead volume in conventional or Sahai's method does not follow its definition in the model assumption, which probably results in incorrect conclusions for flow field optimization of tundish. In this study, two methods for dead volume calculation are discussed, the well‐mixed volume is further divided into equivalent, active, and dead well‐mixed volume. Therefore, the method for dead volume calculation is revised by eliminating the contribution of dead well‐mixed flow. Water modeling experiments of single and multi‐strand tundish are conducted. The new calculation method is applied to analyze the residence time distribution curves and calculate the dead volume fraction in comparison with the other two methods. The results show after the dead well‐mixed flow is eliminated, the dead volume fraction calculated by the new method is smaller than those calculated by conventional and Sahai's method. According to the flow visualization experiments, the dead volume fraction calculated by the new method in this study is more rational than those calculated by the other two methods. Abstract : Dead volume fractions calculated by conventional and Sahai's combined models are always big, especially in the tundish with fully‐developed well‐mixed flow. This may result in unreasonable methods to optimize the flow field. In this paper, the calculation method for dead volume is revised to show the real characteristics of flow field in a tundish.