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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of thermocapillary convection on the melting of phase change materials in microgravity: Experiments and simulations
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Effect of thermocapillary convection on the melting of phase change materials in microgravity: Experiments and simulations

机译：热量对流对微重力相变材料熔化的影响：实验与仿真

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摘要

Experiments on the melting of n-octadecane in the presence of a free surface were performed under the reduced gravity conditions of a parabolic flight, where natural gravitational convection is negligible. The results constitute the first systematic experimental investigation of the capacity of thermocapillary (Marangoni) convection to enhance heat transfer during the melting of organic Phase Change Materials (PCMs) in microgravity, where their low thermal conductivity leads to significant lag (long response times) that, in some applications, constrains their utility as passive thermal control devices. Rectangular containers of three different aspect ratios holding n-octadecane and a layer of air were heated from one side in order to observe the melting process. During the relatively short microgravity periods, which lasted approximately 20 s, the effect of thermocapillary convection remained concentrated in a layer near the free surface that is thinner than the PCM height H for the aspect ratios considered. The weak dependence of this layer on the lower region, where heat transport is dominated by thermal diffusion, means that the relative contribution of thermocapillary convection decreases with H. The experimental results are supported and complemented by a series of numerical simulations modelling the phase change and liquid dynamics with an enthalpy-porosity-based formulation of the Navier-Stokes equations. Very good agreement with the experimental observations is found.
机译：在抛物线飞行的减少的重力条件下进行N-octandane在自由表面存在下进行的实验，自然引力对流可忽略不计。结果构成了热毛细血管（Marangoni）对流能力的第一种系统实验研究，以提高微普理的有机相变材料（PCM）熔化过程中的热传递，其中它们的低导热率导致显着的滞后（长响应时间）在某些应用中，将其实用性约束为被动热控制设备。持有N-十八烷烷的三个不同纵横比的矩形容器和一层空气从一侧加热，以观察熔化过程。在相对短的微疱疹期间，其持续大约20s，热量量对流的效果仍然集中在比PCM高度H薄的自由表面附近的层中，对于考虑的纵横比。该层在较低区域上的弱依赖性，其中热传输通过热扩散主导地位，意指热量达克朗对流的相对贡献随着H的支持和补充，通过建模相变的一系列数值模拟来支持和互补实验结果液体动力学具有基于焓 - 孔隙率的Navier-Stokes方程式的制剂。发现了与实验观察结果非常好的同意。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第6期|119717.1-119717.13|共13页
  • 作者

    P. Salgado Sanchez; J.M. Ezquerro; J. Porter; J. Fernandez; I. Tinao;

  • 作者单位

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

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

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

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

    E-USOC Center for Computational Simulation Escuela Tecnica Superior de Ingenieria Aeron&utica 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; Microgravity;

    机译：相变材料;热量效应;Marangoni对流;微匍匐;

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