基于COMSOL~?模拟材料孔隙率与导热系数的演变关系  

The Evolution Relation Between Materials’Porosity and Thermal Conductivity Based on the Simulation by COMSOL~? Software

作　　者：丁杨 邓满宇 周双喜[2] 王中平[3] 董晶亮 魏永起 DING Yang;DENG Mangyu;ZHOU Shuangxi;WANG Zhongping;DONG Jingliang;WEI Yongqi(School of Architecture engineering,Zhejiang University,Hangzhou 310058;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang330013;School of Materials Science and Engineering,Tongji University,Shanghai 201804)

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]华东交通大学土木建筑学院,南昌330013 [3]同济大学材料科学与工程学院,上海201804

出　　处：《材料导报》2019年第A01期211-213,共3页Materials Reports

基　　金：国家重点研发项目(2016YFC0700807; 2017YFC0504506; 2017YFC0504503);国家青年基金项目(51708220);水利部黄土高原水土流失过程与控制重点实验室开放课题基金(201806)~~

摘　　要：为研究材料不同孔隙率对其导热系数的影响,通过MATLAB建立随机分布模型,结合COMSOL■有限元软件和经典理论计算公式进行分析,得出:基于MATLAB随机生成代码能够呈现出材料孔隙率的变化,并且COMSOL■能够有效定性地计算出导热系数;Zimmerman模型计算出的导热系数与Campbell-Allen模型和COMSOL■相差较大,Campbell-Allen模型与COMSOL■计算结果较为吻合;COMSOL■计算得出的导热系数变化曲线是由凹函数与凸函数组成,出现这一现象是由于孔洞的出现使得传热路径发生了变化。In order to study the effect of different porosity on thermal conductivity of materials,a random distribution model is established by MATLAB,and the analysis is made by COMSOL■finite element software and classical theoretical calculation formula.It is concluded that the random gene rated code based on MATLAB can show the change of material porosity,and COMSOL■can effectively calculate the thermal conductivity qualitatively;the thermal conductivity calculated by Zimmerman model is quite different from COMSOL■model and Campbell-Allen model,Campbell-Allen model is in good agreement with the results of COMSOL calculation.The curve of thermal conductivity calculated by COMSOL■is composed of concave function and convex function.This phenomenon occurs because the occurrence of holes will lead to the change of heat transfer path,so that the change rate of thermal conductivity will change.

关 键 词：孔隙率 导热系数 COMSOL Campbell-Allen模型 Zimmerman模型 

分 类 号：TQ02[化学工程] TU375[建筑科学—结构工程]