Natural convection in melt crystal growth - The influence of flow pattern on solute segregationThe results of two lines of research aimed at calculating the structure of the flows driven by buoyancy in small-scale crystal growth systems and at understanding the coupling between these flows, the shape of the solidification interface, and dopant segregation in the crystal are reviewed. First, finite-element methods are combined with computer-aided methods for detecting multiple steady solutions to analyze the structure of the buoyancy-driven axisymmetric flows in a vertical cylinder heated from below. This system exhibits onset of convection, multiple steady flows, and loss of the primary stable flow beyond a critical value of the Rayleigh number. Second, results are presented for calculations of convection, melt/solid interface shape, and dopant segregation within a vertical ampoule with thermal boundary conditions that represent a prototype of the vertical Bridgman growth system.
Document ID
19840046368
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Brown, R. A. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Yamaguchi, Y. (Massachusetts Inst. of Tech. Cambridge, MA, United States)