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深入研究了粒子空间分布对材料导热性能的影响,探索了有效导热通路形成的必要条件。为了解决任意体积分数、指定空间构型的代表体积元(RVE)建模难题,用空间分布势能函数来描述目标空间分布构型,设计了Monte Carlo可控空间分布算法,该算法能够有效生成包含团簇和网链结构的任意空间构型的RVE。模拟研究结果表明:相同体积分数下,网链构型较团簇构型更能有效地形成导热通路,具有更高的热导率;体积分数对有效导热通路能否形成有重要影响,仅当体积分数大于20%之后,才具备形成有效导热通路的条件;粒子间距只有小于一定水平时,导热通路才能有效形成,随着粒子间距的增加,热导率成指数衰减。一定量的体积分数和较有效的粒子分布是形成有效导热通路的两个必要条件,二者缺一不可。
The effect of the spatial distribution of particles on the thermal conductivity of the material is deeply studied, and the necessary conditions for the formation of an effective thermal conduction path are explored. In order to solve the modeling problem of representative volume element (RVE) with arbitrary volume fraction and specified spatial configuration, the spatial distribution potential function is used to describe the target spatial distribution configuration. Monte Carlo controllable spatial distribution algorithm is designed. RVE of any spatial configuration of clusters and network structures. The simulation results show that: the same volume fraction, the network chain structure than the cluster configuration more effective in the formation of thermal conduction path, with higher thermal conductivity; volume fraction of effective thermal conduction path can have a significant impact, only if When the volume fraction is more than 20%, the effective heat conduction path is formed. When the particle spacing is less than a certain level, the heat conduction path can be effectively formed. As the particle spacing increases, the thermal conductivity exponentially decays. A certain amount of volume fraction and more effective particle distribution are the two necessary conditions for the formation of an effective thermal conduction path, both of which are indispensable.