大孔隙对多孔介质导热性能影响的数值分析  

Numerical analysis of the influence of macropore on thermal conductivity of porous media

作　　者：李小川[1] 徐友伟[1] 黄庠永[1] 

机构地区：[1]扬州大学能源与动力工程学院,江苏扬州225127

出　　处：《华北电力大学学报（自然科学版）》2012年第6期76-79,共4页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51079125);江苏省高校自然科学基金资助项目(10KJB470009);扬州大学科技创新培育基金资助项目(2011CXJ038)

摘　　要：采用有限体积方法求解Laplace方程,对非均匀多孔介质中大孔隙对导热性能的影响规律进行数值分析。研究结果表明,有效导热系数随着大孔隙的形状、排列方式、连通性和方向的不同呈现出很大的波动性,其中大孔隙的连通性和方向对多孔介质导热性能的影响尤其严重。研究结果可为非均匀多孔介质导热性能预测模型的改进提供参考依据。Based on the finite volume method, the influences of macropores on thermal conductivity of heterogeneous porous media are numerically analysized by solving the Laplace equation. Results indicate that the thermal conductivity presents very high volatility along with the variation of the shape, arrangement, and the connectivity and directionality of maeropores. The connectivity and directionality has a far greater influence than the former. The results of this paper have a certain reference value for the improvement of heat conduction model of heterogeneous porous media.

关 键 词：大孔隙 多孔介质 导热性能 数值分析 

分 类 号：TK121[动力工程及工程热物理—工程热物理]