Two-Dimensional and Three-Dimensional Numerical Simulation of Vapor Transport Process
In this chapter, the PVT process is numerically investigated using both two-dimensional and three-dimensional formulation of the governing equations and associated boundary conditions. Both the incompressible Boussinesq approximation and a compressible model are tested to determine the influence of the thermal environments, the residual gas pressure as well as the gravity direction and magnitude on the process and to discern the differences between the two approaches. The results on the ZnSe system show that both the incompressible and compressible approximations provide comparable results and the presence of a residual gas tends to measurably reduce the mass flux in the system. Detailed flow patterns and velocities as well as thermal and concentration profiles were calculated and the shear flow velocity in the horizontal configuration supports the step growth mechanism observed experimentally.
KeywordsTwo-dimensional numerical simulation Three-dimensional numerical simulation Boussinesq approximation
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