Three-dimensional convection and solute segregation in vertical Bridgman crystal growth

摘要: Abstract Perfect axisymmetry is difficult to achieve in the vertical Bridgman crystal growth. Nonaxisymmetry is, a certain degree, always present real growth configuration. To study how fluid flow and solute fields process are affected by slight deviations from axisymmetry, three-dimensional finite-volume/Newton method developed. Pseudosteady-state heat mass transfer, flow, front solved simultaneously. The calculated results for axisymmetric cases compared with those two-dimensional finite volume element methods, they excellent agreement. Calculated also show that easily induced imperfect axisymmetry. A slightly tilted ampoule or small temperature gradient azimuthal direction could break dramatically affect patterns segregation.