Multiscale modeling of the thermal conductivity of wood and its application to cross-laminated timber
Multiscale modeling of the thermal conductivity of wood and its application to cross-laminated timber
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DOI：
10.1016/j.ijthermalsci.2019.05.016
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发表时间：
2019-10
影响因子：
4.5
通讯作者：
A. R. Díaz;E. S. Saavedra Flores;S. Yanez;D. Vasco;J. Pina;Carlos Felipe Guzmán
中科院分区：
文献类型：
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作者：
A. R. Díaz;E. S. Saavedra Flores;S. Yanez;D. Vasco;J. Pina;Carlos Felipe Guzmán
本文采用基于计算均匀化的多尺度建模策略，计算木材的导热系数，研究正交层积材的热性能。为了在多尺度模型框架内确定木材的导热系数，研究了其微观组分的行为。通过遵循自下而上的方法，材料的计算均匀化在纳米级上依次进行，然后在微米级上进行，从而得到木材的有效导热率。此外，还分析了纤维素体积分数和微纤丝角对细胞壁材料导热系数的影响。这些研究导致的有效导热系数分量为0.308 W/（m K），0.107 W/（m K），和0.115 W/（m K），沿着木材的纵向，径向和切向轴，分别。将这些值与已发布的数据进行比较，并成功验证。几个宏观应用进行了研究。特别是，两种类型的面板到面板的连接上的散热的影响进行了评估，在交叉层压木材面板。
In this work, a computational homogenization-based multiscale modeling strategy is adopted to compute the thermal conductivity of wood and to study the thermal performance of cross-laminated timber. In order to determine the thermal conductivity of wood within a multiscale modeling framework, the behavior of its microscopic constituents is investigated. By following a bottom-up approach, the computational homogenization of the material is sequentially carried out at the nanometer level and then, at the micrometer scale, resulting in the effective thermal conductivity of wood. Furthermore, the influence of the cellulose volume fraction and the microfibril angle on the cell-wall material's thermal conductivity is analyzed. These studies lead to the effective thermal conductivity components of 0.308 W/(m K), 0.107 W/(m K), and 0.115 W/(m K), along the longitudinal, radial and tangential axes of wood, respectively. These values are compared to published data and are validated successfully. Several macroscopic applications are investigated. In particular, the influence of two types of panel-to-panel connections on the thermal dissipation is assessed in a cross-laminated timber panel.