Numerical simulation of transport phenomena during strip casting with EMBr in a single belt caster
来源期刊：中南大学学报(英文版)2014年第6期
论文作者：GONG Hai-jun(龚海军) LI Xin-zhong(李新中) XU Da-ming(徐达鸣) GUO Jing-jie(郭景杰)
文章页码：2150 - 2159
Key words：single belt casting; electromagnetic brake (EMBr); flow field; direct-SIMPLE algorithm
Abstract: A theoretical investigation of fluid flow, heat transfer and solidification (solidification transfer phenomena, STP) was presented which coupled with direct-current (DC) magnetic fields in a high-speed strip-casting metal delivery system. The bidirectional interaction between the STP and DC magnetic fields was simplified as a unilateral one, and the fully coupled solidification transport equations were numerically solved by the finite volume method (FVM). While the magnetic field contours for a localized DC magnetic field were calculated by software ANSYS and then incorporated into a three-dimensional (3-D) steady model of the liquid cavity in the mold by means of indirect coupling. A new FVM-based direct-SIMPLE algorithm was adopted to solve the iterations of pressure-velocity (P-V). The braking effects of DC magnetic fields with various configurations were evaluated and compared with those without static magnetic field (SMF). The results show that 0.6 T magnetic field with combination configuration contributes to forming an isokinetic feeding of melt, the re-circulation zone is shifted towards the back wall of reservoir, and the velocity difference on the direction of height decreases from 0.1 m/s to 0. Furthermore, the thickness of solidified skull increases uniformly from 0.45 mm to 1.36 mm on the chilled substrate (belt) near the exit.
GONG Hai-jun(龚海军)1, 2, LI Xin-zhong(李新中)1, XU Da-ming(徐达鸣)1, GUO Jing-jie(郭景杰)1
(1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. College of Mechatronics and Automotive Engineering, Chongqing Jiaotong University,
Chongqing 400074, China)
Abstract:A theoretical investigation of fluid flow, heat transfer and solidification (solidification transfer phenomena, STP) was presented which coupled with direct-current (DC) magnetic fields in a high-speed strip-casting metal delivery system. The bidirectional interaction between the STP and DC magnetic fields was simplified as a unilateral one, and the fully coupled solidification transport equations were numerically solved by the finite volume method (FVM). While the magnetic field contours for a localized DC magnetic field were calculated by software ANSYS and then incorporated into a three-dimensional (3-D) steady model of the liquid cavity in the mold by means of indirect coupling. A new FVM-based direct-SIMPLE algorithm was adopted to solve the iterations of pressure-velocity (P-V). The braking effects of DC magnetic fields with various configurations were evaluated and compared with those without static magnetic field (SMF). The results show that 0.6 T magnetic field with combination configuration contributes to forming an isokinetic feeding of melt, the re-circulation zone is shifted towards the back wall of reservoir, and the velocity difference on the direction of height decreases from 0.1 m/s to 0. Furthermore, the thickness of solidified skull increases uniformly from 0.45 mm to 1.36 mm on the chilled substrate (belt) near the exit.
Key words:single belt casting; electromagnetic brake (EMBr); flow field; direct-SIMPLE algorithm
