Accession Number : ADA301278

Title :   Modeling and Design of High Pressure Crystal Growth Processes.

Descriptive Note : Final rept. 15 Dec 93-30 Apr 95,

Corporate Author : STATE UNIV OF NEW YORK AT STONY BROOK

Personal Author(s) : Prasad, V.

PDF Url : ADA301278

Report Date : 1995

Pagination or Media Count : 6

Abstract : A mathematical model to simulate the low and high pressure crystal growth processes has been developed. The model accounts for both the melt and gas flows induced by buoyancy and capillary forces and by crystal and crucible rotations, radiation heat transfer from the melt and crystal surfaces, and the effect of the magnetic field. An efficient numerical scheme based on multizone adaptive grid generation and curvilinear finite volume flux discretization has been implemented to predict the interface shape and dynamics accurately. The effectiveness of the computer model (MASTRAPP) in solving phase change transport processes with deformable boundaries and moving interfaces has been demonstrated by performing simulations for a wide range of parameters for "one-step" in-situ synthesis and growth of indium phosphide crystals, a process being developed by the USAF Rome Laboratory. An innovative approach of coupled finite volume-finite element algorithm has also been developed to calculate the stresses in the growing crystal. Numerical results show a complex thermal interaction between the gas and the melt flows, and also indicate that the temperature fluctuations can be suppressed by the application of a magnetic field.

Descriptors :   *HIGH PRESSURE, *CRYSTAL GROWTH, STRESSES, THERMAL PROPERTIES, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, LINEAR SYSTEMS, TEMPERATURE, VOLUME, MAGNETIC FIELDS, MODELS, INTERACTIONS, SYNTHESIS, DYNAMICS, INTERFACES, PARAMETERS, FLUX(RATE), DEFORMATION, GRIDS, SHAPE, NUMERICAL ANALYSIS, MOTION, EFFICIENCY, MELTS, CRYSTALS, VARIATIONS, SURFACES, BOUNDARIES, ADAPTIVE SYSTEMS, RANGE(EXTREMES), INDIUM PHOSPHIDES, ROTATION, SUPPRESSION, CAPILLARITY, THERMAL RADIATION, BUOYANCY, GAS FLOW, CURVES(GEOMETRY), CRUCIBLES.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Laminates and Composite Materials
      Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE