基于随机行走方法的多孔介质导热性能研究  

Research on heat transfer in porous media based on random walk method

作　　者：李小川[1] 崔晓峰[2] 张程宾[3] 杨卫波[1] 施明恒[3] 

机构地区：[1]扬州大学能源与动力工程学院,江苏扬州225127 [2]河海大学机电工程学院,江苏常州213022 [3]东南大学能源与环境学院,江苏南京210096

出　　处：《华北电力大学学报（自然科学版）》2012年第4期95-99,共5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(10KJB470009);扬州大学科技创新培育基金资助(2011CXJ038)

摘　　要：在组成相同的情况下,多孔介质传热性能可以表示为孔隙率、孔隙分布、孔隙连通性和方向性参数的函数[1～4]。孔隙分布静态特征可以用面积分形维数来描述,而表征孔隙连通性和方向性的多孔介质动态特性结构参数的相关研究文献较少。本文在传统随机行走模型的基础上,提出了一种新的方向随机行走模型来定量描述多孔介质动态特征,并与有效导热系数建立了定性关系。Under the conditions of the same composition, the effective thermal conductivity of porous media can be expressed as a function of porosity, pore distribution, the connectivity and directionality of pores [ 1 - 5 ]. Static features of pore distribution can be described by area fractal dimension, but the relevant reports about kinetic features that represent connectivity and directionality of pores are limited. In our present work, a novel random walk model was established to describe the kinetic feature of pores quantitatively based on traditional random walk model. A qualitative relationship between heat transfer performance and structural parameters was established preliminarily.

关 键 词：多孔介质 动态特性 分形 随机行走 

分 类 号：TK121[动力工程及工程热物理—工程热物理]