Effect of Surface-Tension Driven Convection on Interfacial Boundary Layer during BaB2O4 Single Crystal Growth

doi:10.3724/SP.J.1077.2007.01239

Abstract

Abstract: Surface-tension driven convection in BaB₂O₄ (BBO) melt was visualized by means of a high-temperature in situ observation method, and the streamlines of steady thermocapillary convection was marked in the form of an axially symmetric pattern. Based on the observation of crystal rotation, the widths of interfacial concentration, heat and momentum boundary layers were calculated respectively. The influence of thermocapillary convection on boundary layer thickness was also investigated. Results show that the concentration boundary layer is much thinner than heat and momentum boundary layers, which indicates that mass diffusion plays a dominating role for interfacial transport. additionally, the width of the boundary layer is decreased with the increasing of dimensionless Marangoni number linearly.

Key words: crystal growth, surface-tension driven convection, boundary layer, BaB₂O₄

CLC Number:

PAN Xiu-Hong,JIN Wei-Qing,AI-Fei,LIU Yan,ZHANG Ying. Effect of Surface-Tension Driven Convection on Interfacial Boundary Layer during BaB₂O₄ Single Crystal Growth[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.01239.

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Effect of Surface-Tension Driven Convection on Interfacial Boundary Layer during BaB₂O₄ Single Crystal Growth

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