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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermocapillary effects during the melting in microgravity of phase change materials with a liquid bridge geometry
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Thermocapillary effects during the melting in microgravity of phase change materials with a liquid bridge geometry

机译：液态桥几何形式变化材料微沉降期间热量施用

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摘要

A detailed numerical investigation of the melting of phase change materials (PCMs) in microgravity is presented. We consider the high Prandtl number alkane n-octadecane and quantify the effect of thermocapillary convection on the heat transfer observed during axisymmetric melting with a liquid bridge geometry. The phase change is studied by varying key dimensionless parameters including Marangoni (Ma) and Stefan (Ste) numbers, which are selected by the applied temperature difference between the circular supports, and geometry, which is characterised by the aspect ratio Γ= L/R and the dimension-less volume V. The case of cylindrical geometry with ν = 1 is considered first, and detailed analyses of the effect of both Ma (Ste) and Γ on heat transport and the type of oscillatory flow that appears in the liquid phase are provided. The results are compared with those available in the literature for rectangular geometry, demonstrating an improvement of approximately 50% for the cylindrical case. We further extend the analysis to noncylindrical configurations with V≠1 that correspond to stable liquid bridges when fully melted.
机译：提出了微匍匐中相变材料（PCMS）熔化的详细数值研究。我们考虑高prandtl数量烷烃正八烷烷，并量化热量达比对流对轴对称熔化期间观察到的热传递的影响，液态桥几何形状。通过在圆形支撑件和几何形状之间的施加的温差选择的诸如施加的温度差异的旋转无量纲参数来研究相位变化，其特征在于纵横比γ= l / r和尺寸的体积V.首先考虑具有ν= 1的圆柱形几何形状的情况，并详细分析MA（STE）和γ对热传输的影响以及液相中出现的振荡流动的类型提供。将结果与文献中可用的矩形几何形状进行比较，圆柱形壳体的提高约50％。我们进一步将分析延伸到非狭窄的非狭窄配置，其在完全熔化时对应于稳定的液态桥。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121586.1-121586.12|共12页
  • 作者

    R. Varas; P. Salgado Sanchez; J. Porter; J.M. Ezquerro; V. Lapuerta;

  • 作者单位

    E-USOC Center for Computational Simulation Universidad Politecnica de Madrid Escuela Tecnica Superior de Ingenieria Aeronautica y del Espacio Universidad Politecnica de Madrid Plaza Cardenal Cisneros 3 Madrid 28040 Spain;

    E-USOC Center for Computational Simulation Universidad Politecnica de Madrid Escuela Tecnica Superior de Ingenieria Aeronautica y del Espacio Universidad Politecnica de Madrid Plaza Cardenal Cisneros 3 Madrid 28040 Spain;

    E-USOC Center for Computational Simulation Universidad Politecnica de Madrid Escuela Tecnica Superior de Ingenieria Aeronautica y del Espacio Universidad Politecnica de Madrid Plaza Cardenal Cisneros 3 Madrid 28040 Spain;

    E-USOC Center for Computational Simulation Universidad Politecnica de Madrid Escuela Tecnica Superior de Ingenieria Aeronautica y del Espacio Universidad Politecnica de Madrid Plaza Cardenal Cisneros 3 Madrid 28040 Spain;

    E-USOC Center for Computational Simulation Universidad Politecnica de Madrid Escuela Tecnica Superior de Ingenieria Aeronautica y del Espacio Universidad Politecnica de Madrid Plaza Cardenal Cisneros 3 Madrid 28040 Spain;

  • 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

    Phase change materials; Thermocapillary effect; Marangoni convection; Liquid bridge;

    机译：相变材料;热量效应;Marangoni对流;液体桥梁;

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