多孔石墨泡沫材料内流动阻力的扩展Ergun方程  

Extended Ergun Equation of the Flow Resistance Characteristics in Porous Graphitic Foam

作　　者：张新铭[1] 凌娅[1] 谷沁洋[1] 

机构地区：[1]重庆大学动力工程学院低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《材料导报》2012年第4期118-121,共4页Materials Reports

基　　金：重庆市科技攻关计划资助项目(81826);"211工程"三期建设项目(S-09101);中央高校基本科研业务费资助项目(CDJXS11140014)

摘　　要：近年来,金属泡沫、石墨泡沫等多孔功能材料因具有低密度、高导热、耐高温和耐腐蚀等特点而被广泛关注和研究。为了简化石墨泡沫内流动阻力的预测计算,根据石墨泡沫材料微孔的空间几何结构,对比颗粒填充床流动模型的Ergun型方程,建立面心立方(Face centered cubic,FCC)泡沫模型,以流速、孔隙率和比表面积分别相等则流动阻力相等为假设,推导了多孔泡沫孔径与颗粒床粒径间的对应关系,提出了适用于多孔泡沫介质内流动阻力预测的扩展Ergun方程。用所得方程进行了验证计算,并与数值模拟结果作了比较分析。Graphitic foam and metal foam were newly-developed porous materials with low density, high thermal conductivity, heat resistance, corrosion resistance and so on. Based on the pore structure of the graphitic foam, the face centered cubic（FCC） foam model was created for numerical analysis on flow resistance. According to the classic Ergun equation for particle packed bed, under the condition of same specific surface area in the flow resistance, the functional relationship between the pore diameter of FCC foam model and the particle diameter of packed bed was derived, a flow resistanee equation named extended Ergun equation for the type of porous foam medium such as graphite foam was presented, and the predicted values of the equation were compared with the numerical simulations, the results indicate that the applicability of the Eouation presented.

关 键 词：多孔介质 泡沫材料 流动阻力 扩展方程 

分 类 号：TB383[一般工业技术—材料科学与工程] TQ021.4[化学工程]