A New Approach to Calculate Different Regions' Volume Fraction in Tundish

摘要

So far, there are two widely used approaches to calculate different regions' volume fraction for single-strand tundish, but they are proved to have some limitation. Few people do research about approach of calculating different regions' volume fraction for multi-strand tundish. These will greatly inhibit the development of tundish designing and tundish metallurgy. In this paper, further study about the application of residual time distribution (RTD) concept in tundish metallurgical field is carried on, including the case of single-strand tundish and the case of multi-strand tundish. Then, basing on mathematical simulation, a completely new calculation approach is attempted to propose for the first time, and it is easy to calculate the different regions' volume fraction in tundish. In the new approach, the standard is proposed definitely for dealing with RTD-curve. It is much complete and helpful for the application of RTD concept in metallurgy field. Definition of all regions in tundish flow field are further specified in the new approach, and especially, dead region's definition is made more clear, which concept was always ambiguous for people before, and it can be adaptable to redefine according the actual demand. Newly proposed approach can distinguish different flow patterns sensitively. Especially, new approach is suitable for both of single-strand tundish and multi-strands tundish, but no other approach can do it so far. What's more, new approach has considered the bypass flow, which is critical for tundish metallurgy, and new approach is able to calculate the bypass flow 's volume fraction, and other approach can do it neither. So new approach will be more complete and reasonable to evaluate and improve the tundish designing and tundish metallurgy.