Numerical Simulation of the In-Mold Electromagnetic Stirring of Slabs in a Continuous Casting Process
Date Issued
2005
Date
2005
Author(s)
Tzeng, Shu-Wen
DOI
zh-TW
Abstract
A three-dimensional numerical simulation for the steel continuous casting process with the in-mold electromagnetic stirring (MEMS) of slabs was investigated using the commercial FIDAP code. Electromagnetic stirring is used to reduce the defects and to improve the quality of the final products. In this study, a simplified model for the electromagnetic force was used to simplify the electromagnetic force (EMF) problem. Three port angles for the SEN design and two intensities of magnetic forces were simulated.
The results show that: (1) In EMS off operation, maximum velocities at the meniscus are all about 10cm/s while average fluctuation levels at the meniscus are about 0.1mm, and average temperatures at meniscus are about 1528℃. Furthermore, the case mold15d has smaller F-factor, lower impingement point, and higher average temperature at meniscus. The results show the mold with noz15d could be a better design. (2) In EMS on operation, the velocity profiles and temperature distribution are distinct from those without EMS. The impingement points have been lifted up to almost same position about 22~23cm below the meniscus at two narrow sides. Average temperature at meniscus is decreased by 2~3℃. It is seen that regular circulations of velocity pattern and temperature pattern at meniscus. Since the velocity at meniscus has increased, the temperature profiles at same narrow position became uniform. (3) For cases with 0.13T maximum magnetic density, the maximum velocity has increased by a factor 8 and average fluctuation level increased to be 10mm. For cases with 0.07T maximum magnetic density, the maximum velocity has increased by a factor 4 and average fluctuation level increased to be 2mm. (4) Comparisons of the results of F-factors for molds with EMS show that similar results are obtained. Molds with noz25d have smallest values of F-factor and better in symmetry for the two maximum magnetic flux densities. The results show that noz25d could be a better design for molds with EMS.
Subjects
連續鑄造
扁鋼胚
電磁攪拌
流場數值解析
電磁力
環流
Continuous casting
Slab
In-mold electromagnetic stirring
MEMS
Electromagnetic force
EMF
circulation
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-94-R92524057-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):3613ee1dc2d6ab67e1427afca0390bc1