泡沫陶瓷多孔介质有效导热特性研究  

Characteristics of the Effective Thermal Conductivity of Highly Porous Ceramic Foam

作　　者：王关晴[1] 黄曙江[1] 丁宁[1] 罗丹[1] 黄雪峰[1] 刘彦[1] 徐江荣[1] 

机构地区：[1]杭州电子科技大学数值计算与工程应用研究所,浙江省杭州市310018

出　　处：《中国电机工程学报》2010年第11期73-78,共6页Proceedings of the CSEE

基　　金：浙江省自然科学基金资助项目(Y1090313);能源清洁利用国家重点试验室开放基金(ZJUCEU2009003)~~

摘　　要：利用稳态平面热源法对泡沫陶瓷多孔介质的有效导热性能进行试验研究。以高空隙率的碳化硅和氧化铝泡沫陶瓷为对象,在分析温度对泡沫陶瓷有效导热系数影响的基础上,给出了多孔介质当量孔径变化对泡沫陶瓷有效导热系数的影响变化规律。指出随着温度的升高,碳化硅和氧化铝泡沫陶瓷有效导热系数均是先略有减小,随后再逐渐增加;在空隙率一定的条件下,随着多孔介质当量孔径孔逐渐减小(孔密度增加),有效导热系数先是略有减小,随后逐渐增加;与温度影响相比,泡沫陶瓷孔径变化影响相对较小。The characteristics of effective thermal conductivity of highly porous ceramic foam were investigated experimentally by steady plane heat source technique. The Influence of temperature and pore size on the effective thermal conductivity of the porous ceramic foam was analyzed in details by making the SiC and Al2O3 ceramic foam as test sample. The results show that at the range of the experimental temperature, the effective thermal conductivity of both SiC and Al2O3 foam ceramic decreases slightly at first, and then increases gradually with increase of the temperature. At the condition of constant porosity, the effective thermal conductivity also firstly decreases slightly, and then increases gradually with decrease of the equivalent diameter. Compared with the temperature, the variation pore size of the porous foam ceramic has relative small effects on the thermal conductivity at the constant porosity.

关 键 词：泡沫陶瓷 多孔介质 导热系数 多孔介质燃烧 

分 类 号：TK124[动力工程及工程热物理—工程热物理]