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首页> 外文期刊>International Journal of Heat and Mass Transfer >Total enthalpy-based lattice Boltzmann simulations of melting in paraffin/metal foam composite phase change materials
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Total enthalpy-based lattice Boltzmann simulations of melting in paraffin/metal foam composite phase change materials

机译：基于总焓的晶格Boltzmann在石蜡/金属泡沫复合相变材料中熔化的模拟

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摘要

Phase change materials (PCM) have become a popular choice for building thermal management due to their low cost, chemical stability and high energy density. Though, their low thermal conductivity is a limiting factor in their use. To overcome this limitation, there has been considerable interest in the application of highly conductive substrates such as metal foams. These offer a potential to increase the thermal performance of PCM and to broaden their area of application. However, the influence of micro structured properties on melting is not completely understood and difficult to explore experimentally. In this study, a lattice Boltzmann method (LBM) based on the two relaxation time (TRT) collision scheme for the simulation of melting and conjugate heat transfer is proposed, validated and applied to melting in three-dimensional (3D) structures of composite PCM-metal foam latent heat storages. The model and its implementation is validated against the analytical transient solution of the Stefan problem, proving superlinear grid convergence and close agreement for a large range of lattice relaxation times and Stefan numbers. The interfacial diffusion is found to be effectively limited by leveraging a TRT collision scheme. Very close accordance to measurements and simulation results obtained with other methods is shown for the validation case of melting gallium including natural convection in 2D and 3D. Subsequently, the melting of paraffin in two complex metal foam geometries is simulated. The present simulations successfully describe the multi-domain heat transfer in 3D, where the thermal conductivity of the foam is more than 1000 times larger than that of the paraffin. The predicted progression of the melting front and the influence of the different foam's specific surface area are in close agreement to earlier simulations.
机译：相变材料（PCM）由于其低成本，化学稳定性和高能量密度而成为建筑热管理的流行选择。但是，它们的低导热率是其使用中的限制因素。为了克服这种限制，对诸如金属泡沫的高导电底物的应用具有相当大的兴趣。这些提供了增加PCM的热性能并扩大其应用领域的潜力。然而，微结构化性质对熔化的影响尚未完全理解，并且难以在实验上探索。在该研究中，提出了一种基于两个弛豫时间（TRT）碰撞方案的格子Boltzmann方法（LBM），用于模拟熔化和共轭热传递的模拟，验证并施加到复合PCM的三维（3D）结构中的熔化 - 泡沫潜热储存。该模型及其实施采用STEFAN问题的分析瞬态解决方案验证，证明超连续性电网收敛和近距离晶格放松时间和斯特凡数的恰逢吻合。发现界面扩散通过利用TRT碰撞方案有效地限制。非常近于测量和用其他方法获得的仿真结果显示为熔化镓的验证情况，包括2D和3D的自然对流。随后，模拟了两种复合金属泡沫几何形状中石蜡的熔化。本仿真成功地描述了3D中的多域热传递，其中泡沫的导热率大于石蜡的1000倍。预测的熔化前沿的进展和不同泡沫的比表面积的影响与早期的模拟相一致。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第7期|119870.1-119870.12|共12页
  • 作者

    Maximilian Gaedtke; S. Abishek; Ryan Mead-Hunter; Andrew J. C. King; Benjamin J. Mullins; Hermann Nirschl; Mathias J. Krause;

  • 作者单位

    Lattice Boltzmann Research Group Karlsruhe Institute of Technology Karlsruhe Germany Institute for Mechanical Process Engineering and Mechanics Karlsruhe Institute of Technology Karlsruhe Germany;

    Occupation Environment and Safety School of Public Health Curtin University Perth Australia Fluid Dynamics Research Group and the Curtin Institute for Computation Curtin University Perth Australia;

    Occupation Environment and Safety School of Public Health Curtin University Perth Australia Fluid Dynamics Research Group and the Curtin Institute for Computation Curtin University Perth Australia;

    Fluid Dynamics Research Group and the Curtin Institute for Computation Curtin University Perth Australia;

    Occupation Environment and Safety School of Public Health Curtin University Perth Australia Fluid Dynamics Research Group and the Curtin Institute for Computation Curtin University Perth Australia;

    Institute for Mechanical Process Engineering and Mechanics Karlsruhe Institute of Technology Karlsruhe Germany;

    Lattice Boltzmann Research Group Karlsruhe Institute of Technology Karlsruhe Germany Institute for Mechanical Process Engineering and Mechanics Karlsruhe Institute of Technology Karlsruhe Germany Institute for Applied and Numerical Mathematics Karlsruhe Institute of Technology Karlsruhe Germany;

  • 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

    Lattice Boltzmann method; Phase change material; Melting; Solid liquid phase change; Paraffin/metal foam composite;

    机译：格子Boltzmann方法;相变材料;融化;固体液相变化;石蜡/金属泡沫复合材料;

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