Tham khảo tài liệu 'two phase flow phase change and numerical modeling part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 140 Two Phase Flow Phase Change and Numerical Modeling Fig. 13 presents the temperature distribution till solidus temperature inside a slab at two different positions in the caster parts a and b show results at about m and m from the meniscus level in the mold respectively. The following casting parameters were selected in this case C SPH 20K and Hc m min. It is interesting to note that the shell grows faster along the direction of the smaller size . the thickness than the width of the slab. Fig. 14 presents some more typical results for the same case. The temperature in the centre is presented by line 1 and the temperature at the surface of the slab is presented by line 2. The shell thickness s and the distance between liquidus and solidus w are presented by dotted lines 3 and 4 respectively. In part b of Fig. 14 the rate of shell growth ds dt the cooling rate Cr and the solid fraction fs in the final stages of solidification are presented. Finally in part c the local solidification time Tr and secondary dendrite arm spacing Ảsdas are also presented. It is interesting to note that the rate of shell growth is almost constant for the major part of solidification. Fig. 14. Results with respect to distance from the meniscus In part a lines 1 and 2 illustrate the centreline and surface temperatures of a 130 X 390 mm X mm Sovel slab lines 3 and 4 depict the shell thickness and the distance between the solidus and liquidus temperatures in part b the solid fraction fs the local cooling-rate Cr and the rate of shell growth ds dt are presented in part c the local solidification time and secondary dendrite arm spacing are depicted as well. Casting conditions c casting speed m min SPH 20 K solidus temperature 1484 C nil temperatures m the graph are ÚỈ C In part a of Fig. 15 line 1 depicts the bulging strain along the caster with the aforementioned formulation. LHS axis is used to present the bulging strain while the RHS axis in part a presents .
