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首页> 外文期刊>International Journal of Heat and Mass Transfer >A combined finite-discrete element method for calculating the effective thermal conductivity of bio-aggregates based materials
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A combined finite-discrete element method for calculating the effective thermal conductivity of bio-aggregates based materials

机译：计算生物骨料基材料有效导热系数的组合有限元法

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摘要

The present paper examines the calculation of thermal conductivity of insulating building materials made from plant particles. To determine the more suitable structure and particle size distribution of raw material to optimize the volume proportion between plant particles, binder and air, a tool for calculating the effective thermal conductivity of heterogeneous materials has been developed. The approach is both based on (i) the discrete element method to generate the volume element and (ii) the finite element method to calculate the homogenized properties. A 3D optical scanner has been used to record plant particle shapes and convert some of them into a cluster of discrete elements. These aggregates are initially randomly distributed in the numerical simulation but without any overlap, and then fall down into a container due to gravity and collide with neighboring particles according to a velocity Verlet algorithm. Once the RVE is built, the geometry is exported in the open-source Salome-Meca platform to be meshed. The calculation of the effective thermal conductivity of the heterogeneous volume is then performed using a homogenization technique, based on an energy method. The numerical model has been applied to packed beds of sunflower pith aggregates. The thermal conductivity of pith particles has been first measured to supply reliable data input for the numerical model. The remarkably low value of this material makes sunflower pith packed beds an excellent candidate for thermal insulation in the building industry. However, due to its low packing density, conduction and radiation heat transfer are significant. The first numerical simulations, considering only conductive heat transfer, differ thus from the measured thermal conductivity on packed beds. Finally, a more robust model taking into account the radiation contribution has been satisfactorily compared with the experimental results.
机译：本文研究了由植物颗粒制成的隔热建筑材料的导热系数的计算。为了确定原料的更合适的结构和粒度分布以优化植物颗粒，粘合剂和空气之间的体积比例，已经开发了一种用于计算异质材料的有效导热率的工具。该方法都基于（i）离散元素方法以生成体积元素，以及（ii）有限元方法以计算均质化特性。 3D光学扫描仪已用于记录植物颗粒的形状，并将其中的一些形状转换为离散元素的簇。这些聚集体最初在数值模拟中随机分布，但没有任何重叠，然后由于重力而掉入容器中，并根据速度Verlet算法与相邻粒子碰撞。一旦构建了RVE，就可以在开源Salome-Meca平台中将几何导出到网格中。然后，基于能量方法，使用均质化技术来计算异质体积的有效导热系数。该数值模型已经应用于葵花髓制粒料的填充床。首先测量了髓颗粒的热导率，以为数值模型提供可靠的数据输入。这种材料的极低价值使向日葵髓填充床成为建筑行业隔热的极佳选择。然而，由于其低堆积密度，传导和辐射热传递是重要的。因此，仅考虑传导性传热的第一个数值模拟与在填充床上测得的热导率不同。最后，一个令人满意的考虑辐射贡献的模型已经与实验结果进行了令人满意的比较。

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  • 作者

    F. Pennec; A. Alzina; N. Tessier-Doyen; B. Naiet-ali; N. Mati-Baouche; H. De Baynast; D.S. Smith;

  • 作者单位

    Croupe d'Etude des Materiaux Heterogenes - Centre Europeen de la Ceramique, 12 me Atlantis, 87068 Limoges Cedex, France;

    Croupe d'Etude des Materiaux Heterogenes - Centre Europeen de la Ceramique, 12 me Atlantis, 87068 Limoges Cedex, France;

    Croupe d'Etude des Materiaux Heterogenes - Centre Europeen de la Ceramique, 12 me Atlantis, 87068 Limoges Cedex, France;

    Croupe d'Etude des Materiaux Heterogenes - Centre Europeen de la Ceramique, 12 me Atlantis, 87068 Limoges Cedex, France;

    Clermont University, Universite Blaise Pascal, Institut Pascal UMR CNRS 6602, Campus des Cezeaux, 24 avenue des Landais, F-63174 Aubiere Cedex, France;

    Clermont University, Universite Blaise Pascal, Institut Pascal UMR CNRS 6602, Campus des Cezeaux, 24 avenue des Landais, F-63174 Aubiere Cedex, France;

    Croupe d'Etude des Materiaux Heterogenes - Centre Europeen de la Ceramique, 12 me Atlantis, 87068 Limoges Cedex, France;

  • 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

    thermal conductivity; sunflower pith aggregate; packed bed; discrete element; homogenization; radiation;

    机译：导热系数;葵花籽髓骨料;床铺离散元素均质化辐射;

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