多孔介质传热特性的细观模拟  

Meso-Mechanical Simulation of Heat Transfer Characteristics in Porous Media

作　　者：闫辉[1] 杜太焦[1] 彭国良[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2017年第2期83-89,共7页Modern Applied Physics

基　　金：国家自然科学基金重点资助项目(91330205)

摘　　要：基于随机介质的谱分解理论,建立了二维多孔介质的细观模型,发展了多孔介质传热问题的多松弛格子Boltzmann方法求解算法,模拟了恒定热流加载下含基体孔隙复合材料的传热过程,计算了碳化硅多孔材料的等效热导率。结果表明,多孔介质的传热过程与孔隙率、孔隙结构密切相关,孔隙率越大材料传热性能越差,等孔隙率条件下,多孔介质沿某一方向的等效热导率随该方向孔隙自相关长度的增加而变大。Based on the theory of spectral factorization in random media,a 2D model of porous media is reconstructed,and the multiple relaxation time lattice Boltzmann method is used to solve the heat transfer problem in porous media.The heat conduction process of composite material with voids in its matrix is simulated,and the effective thermal conductivity of SiC porous media is calculated.The results indicate that the heat transfer process of porous media is closely related to its porosity and meso-structures.The increase of porosity reduces the heat conduction performance of porous media,and if the porosity remains unchanged,the effective thermal conductivity of porous media along certain direction increases as the autocorrelation length of voids along the direction becomes greater.

关 键 词：多孔介质 细观模拟 格子BOLTZMANN方法 等效热导率 

分 类 号：TN249[电子电信—物理电子学]