연속주조 빌렛의 3차원 열 및 유동해석

Three-dimensional Numerical Modeling of Fluid Flow and Heat Transfer in Continuously Cast Billets

  • 이성윤 (연세대학교 금속공학과) ;
  • 이상목 (연세대학교 금속공학과) ;
  • 박중길 (포항종합제철 산업기술연구소 선강연구팀) ;
  • 홍준표 (연세대학교 금속공학과)
  • Lee, Sung-Yoon (Center for Computer-Aided Materials Processing (CAMP), Dept. of Metallurgical. Eng., Yonsei Univ.) ;
  • Lee, Sang-Mok (Center for Computer-Aided Materials Processing (CAMP), Dept. of Metallurgical. Eng., Yonsei Univ.) ;
  • Park, Joong-Kil (Iron & Steel Making Research Team, POSCO) ;
  • Hong, Chun-Pyo (Center for Computer-Aided Materials Processing (CAMP), Dept. of Metallurgical. Eng., Yonsei Univ.)
  • 발행 : 2000.10.20

초록

A three-dimensional model was developed in order to simulate heat and fluid flow of a continuous casting billet. The model was coded with the general-purpose CFD program FIDAP, using the finite element method. The present model consists of 2 individual calculation schemes, named model 1 and model 2. Mold region only was calculated to check the pouring stream through submerged nozzle with model 1. Entire region, which consists of mold, secondary cooling, radiation cooling was calculated to predict crater end position, temperature profile and solid shell profile(model 2). Standard $k-{\bullet}\hat{A}$ turbulence model has been applied to simulate the turbulent flow induced by submerged nozzle. Enthalpy method was adopted for the latent heat of solidification. Fluid flow in mushy zone was treated using variable viscosity approach. The more casting speed and superheat increased, the more metallurgical length increased. The shell thickness at the mold exit is proved to be mainly controlled by superheat by the present simulation. It may be concluded that the present model can be successfully applied far the prediction of heat and fluid flow behavior in the continuous casting process.

키워드