摘要
讨论了块石路堤、护坡试样在表面温度周期波动时自然对流产生的条件,分析了开放系统和封闭系统块石试样内部的热传输机理,以说明其热扩散系数和导热系数的确定方法。指出开放系统的试样由于传热形式不单一而不利于热扩散系数和导热系统的精确测定,而封闭系统试样内部的传热形式以热传导为主。结果表明,可用封闭系统的细长圆柱试样来测试路堤、护坡块石的热扩散系数和导热系数。
Conditions of occurring natural convection in the ballast specimens under cyclically fluctuating surfaceairtemperature were discussed. The heat transfer mechanisms in the porous ballast specimens for tighttest and opentest were studied. And the approach of determing thermal diffusivity and conductivity was discussed. It was presented that the specimen for opentest is not favorable for accurately measuring thermal diffusivity and conductivity due to multiform heat transfer, and for tighttest the thermal conduction is predominant. The results show that for tighttest the thermal diffusivity parameter and conductivity parameter can be determined by using slenderly cylindrical specimen.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2003年第3期6-10,共5页
China Journal of Highway and Transport
基金
中国科学院冻土工程国家重点实验室开放基金项目(200103)
中国科学院"百人计划"项目(200019)
中国科学院资源环境领域知识创新工程重要方向项目(KZCX2-306)
中国科学院寒区旱区环境与工程研究所知识创新工程项目(CACX210015)
关键词
道路工程
块石路堤、护坡
试验研究
多孔介质
自然对流
导热系数
road engineering
ballast embankment and revetment
experimental research
porous media
natural convection
thermal conductivity parameter
