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首页> 外文期刊>Journal of Crystal Growth >Role of marangoni tension effects on the melt convection in directional solidification process for multi-crystalline silicon ingots
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Role of marangoni tension effects on the melt convection in directional solidification process for multi-crystalline silicon ingots

机译：马兰戈尼张力效应对多晶硅锭定向凝固过程中熔体对流的作用

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摘要

We carried out global simulations to investigate the marangoni tension effect on the thermal and flow fields in the silicon melt of the directional solidification process for multi-crystalline silicon ingots. The argon flow rate was varied to provide different solidification conditions and to change the relative values between the argon shear stress and the marangoni tension at the melt free surface. We found that the marangoni tension together with the shear stress mainly influences the upper layer melt convection while the thermal buoyancy force dominates the bulk flow of the melt. At low argon flow rates, the argon shear stress can be neglected and the marangoni tension alone enhances the melt convection intensity near the gas-melt-crucible triple junction point. The marangoni tension is so weak that it cannot modify the melt flow pattern in this case. For medium flow rate, the marangoni tension can significantly weaken the shear stress effect at the outer part of the melt free surface, leading to a distinctive flow pattern in the silicon melt. With further increase in argon flow rate, the shear stress sharply increases and dominates the upper layer melt flow, limiting the marangoni tension effect to the triple point. The numerical results are helpful for better understanding and controlling of the directional solidification process for high quality multi-crystalline silicon ingots.
机译：我们进行了全局模拟，以研究马兰戈尼张力对多晶硅锭定向凝固过程中硅熔体中热场和流场的影响。改变氩气流速以提供不同的固化条件并改变无熔体表面处的氩剪切应力和马兰戈尼张力之间的相对值。我们发现，马兰戈尼张力和剪切应力主要影响上层熔体的对流，而热浮力主导熔体的整体流动。在较低的氩气流量下，可以忽略氩气的剪切应力，仅靠马朗戈尼张力就可以在接近气体熔体坩埚的三重结合点附近提高熔体对流强度。马兰戈尼张力是如此之弱，以至于在这种情况下它无法改变熔体流动模式。对于中等流速，马兰戈尼张力会显着减弱无熔体表面外部的切应力效应，从而导致硅熔体中明显的流动模式。随着氩气流量的进一步增加，剪切应力急剧增加并支配上层熔体流动，从而将马兰戈尼张力效应限制在三点。数值结果有助于更好地理解和控制高质量多晶硅锭的定向凝固过程。

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  • 来源
    《Journal of Crystal Growth》 |2012年第1期|p.40-44|共5页
  • 作者

    Zaoyang Li; Lijun Liu; Xiaohong Nan; Koichi Kakimoto;

  • 作者单位

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China;

    Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A1. Computer simulation; A1. Directional solidification; A1. Marangoni tension; A1. Melt convection; B3. Solar cells;

    机译：A1。计算机仿真;A1。定向凝固;A1。马兰戈尼紧张;A1。对流融化;B3。太阳能电池;

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