Effects of boundary conditions on double-diffusive flow during the solidification process in a binary solution
Conference
Burton, R, Desir, F, Hoo, G et al. (1994). Effects of boundary conditions on double-diffusive flow during the solidification process in a binary solution
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 289 163-167.
Burton, R, Desir, F, Hoo, G et al. (1994). Effects of boundary conditions on double-diffusive flow during the solidification process in a binary solution
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 289 163-167.
The effects of boundary conditions on the double-diffusive flow inside a liquid pool during the solidification process of binary solution are experimentally studied. Four test sumps are built in this study. Two rectangular sumps are built to investigate the effects of bottom cooling in addition to sidewall cooling on the flow inside a rectangular cavity, which is used to simulate the solidification process during a ingot static casting. The other two V-shaped sumps are designed and built to simulate the effects of bottom angles on convective flow during continuous casting. The temperature distribution in the liquid pool is used to analyze the flow patterns driven by both thermal and concentration buoyancy forces. The results indicate that in a rectangular cavity, adding bottom cooling will reduce the thermally driven convective flow before the solidification starts. After dendrites appear, the cavity with the bottom cooling will approach a uniform temperature inside the liquid pool much faster than that in a cavity without bottom cooling. The results also indicate that the bottom angle of a V-shaped sump can significantly change the heat transfer mechanism and flow conditions inside the liquid pool. At an angle of 16 degrees, the thermally driven convective heat transfer controls the fluid flow and heat transfer before solidification starts. After the dendrites appear, a major portion of the domain is controlled by conduction heat transfer. At a small angle, 4 degrees, conduction is the dominant heat transfer mechanism before and after dendrites appear.
