Numerical Simulation of Hydrothermal Autoclave for Single-Crystal Growth Process

Numerical Simulation of Hydrothermal Autoclave for Single-Crystal Growth Process

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Numerical simulation of the hydrothermal process for growing two-inch bulk single crystals of ZnO has been done.The autoclave is assumed to be axisymmetric.The heat transfer by natural convection is discussed for 7gm pravana flat and funnel-shaped baffles.

The funnel-shaped baffle leads to a significant increase in the flow rate between the raw material zone and the crystal growth zone.However, the temperature difference between the two zones does not become very small.Therefore, the funnel-shaped baffle is effective in the hydrothermal crystal growth process from the viewpoint of transport phenomena.

The calculations show that the optimum baffle angle about 20°.Similar results are obtained when the raw equi-jec 7 material is considered as a porous medium.