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<p>In a low-gravity (g/6) environment, the high flow rate is maintained while buoyant convection is somewhat suppressed compared to conditions in terrestrial gravity (1g) and microgravity (10<sup>−4</sup>g), potentially promoting crystal growth via the melt method. To investigate the heat transfer mechanisms and the crystal growth/solidification process of CdTe crystals grown using the Vertical Bridgman (VB) method in g/6 conditions, two-dimensional axisymmetric numerical simulations were performed based on COMSOL simulation software. Comparison of the simulation results for temperature and flow fields in 1g, g/6, and 10<sup>−4</sup>g environments reveals that, the melt flow penetrates a low-temperature melt layer at g/6, resulting in a density-layer penetration effect that mitigates heat accumulation and reduces the streamline bending observed in 1g conditions. However, at g/6, a relative flow also forms above the solid–liquid interface, leading to the greatest interface bending and the steepest temperature gradient among the three gravitational conditions. This phenomenon may promote the accumulation of impurities and defects while simultaneously stabilizing the solid–liquid interface. Finally, a dimensionless parameter is introduced to elucidate the simulation phenomena and confirm the accuracy of the simulations.</p>

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Numerical Study of Temperature and Flow Field Characteristics of CdTe Crystal Growth in Low Gravity Field

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Weiyi He,
  • Xuechao Liu,
  • Hengduo Wu,
  • Shengnan Jiang,
  • Weijie Deng,
  • Kun Chen,
  • Meibo Tang,
  • Xiuhong Pan,
  • Min Jin

摘要

In a low-gravity (g/6) environment, the high flow rate is maintained while buoyant convection is somewhat suppressed compared to conditions in terrestrial gravity (1g) and microgravity (10−4g), potentially promoting crystal growth via the melt method. To investigate the heat transfer mechanisms and the crystal growth/solidification process of CdTe crystals grown using the Vertical Bridgman (VB) method in g/6 conditions, two-dimensional axisymmetric numerical simulations were performed based on COMSOL simulation software. Comparison of the simulation results for temperature and flow fields in 1g, g/6, and 10−4g environments reveals that, the melt flow penetrates a low-temperature melt layer at g/6, resulting in a density-layer penetration effect that mitigates heat accumulation and reduces the streamline bending observed in 1g conditions. However, at g/6, a relative flow also forms above the solid–liquid interface, leading to the greatest interface bending and the steepest temperature gradient among the three gravitational conditions. This phenomenon may promote the accumulation of impurities and defects while simultaneously stabilizing the solid–liquid interface. Finally, a dimensionless parameter is introduced to elucidate the simulation phenomena and confirm the accuracy of the simulations.