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首页> 外文期刊>International Journal of Heat and Mass Transfer >Three-dimensional thermocapillary-buoyancy flow of a binary mixture with Soret effect in a shallow annular pool
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Three-dimensional thermocapillary-buoyancy flow of a binary mixture with Soret effect in a shallow annular pool

机译：Soret效应的二元混合物在浅环形池中的三维热毛细管浮力流

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摘要

This paper presented a series of three-dimensional numerical simulations on the thermocapillary-buoy ancy flow with Soret effect in a shallow annular pool which was filled with the n-decane-hexane mixture with an initial mass fraction of 50%. The Prandtl number and the Lewis number of this binary mixture were 9.08 and 27.89, respectively. The annular pool was heated at the outer cylinder and cooled at the inner cylinder. An adiabatic solid bottom and free surface were considered. The results indicated that the solute concentration gradient depends strongly on the temperature gradient. Due to the Soret effect in the n-decane-hexane mixture, the n-decane with a higher density component gathers at the colder area near the inner cylinder. The critical thermal capillary Reynolds number for the incipience of the three-dimensional oscillatory flow in the n-decane-hexane mixture is smaller than that in the n-hexane fluid, and decreases with the increase of the aspect ratio. A solute concentration fluctuation which is similar to the temperature fluctuation is observed when the three-dimensional oscillatory flow happens. The nondimensional fundamental oscillation frequency is related to the aspect ratio and the thermal capillary Reynolds number. Meanwhile, the azimuthal wave number decreases with the increase of the aspect ratio, but it is independent of the thermal capillary Reynolds number.
机译：本文介绍了在浅环形池中具有索雷特效应的热毛细管浮力流动的三维三维模拟，该浅池中填充了初始质量分数为50％的正癸烷/正己烷混合物。该二元混合物的普朗特数和路易斯数分别为9.08和27.89。环形池在外筒处加热，在内筒处冷却。考虑了绝热的固体底部和自由表面。结果表明，溶质浓度梯度很大程度上取决于温度梯度。由于正癸烷/正己烷混合物中的索雷特效应，具有较高密度成分的正癸烷聚集在内圆柱附近的较冷区域。正癸烷/正己烷混合物中三维振荡流开始的临界热毛细管雷诺数比正己烷流体中的要小，并且随着长径比的增加而减小。当发生三维振荡流时，观察到类似于温度波动的溶质浓度波动。无量纲基本振荡频率与长宽比和热毛细管雷诺数有关。同时，方位波数随长宽比的增加而减小，但与热毛细管雷诺数无关。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第11期|1071-1081|共11页
  • 作者

    Jia-Jia Yu; You-Rong Li; Chun-Mei Wu; Jie-Chao Chen;

  • 作者单位

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400044, China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400044, China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400044, China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400044, China;

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

    Thermocapillary-buoyancy flow; Soret effect; Binary mixture; Annular shallow pool;

    机译：热毛细管浮力流;索雷特效应;二元混合物环形浅水池;

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