摘要
利用微细探针对高温下两种典型土壤的表观热导率进行测试分析。结果表明,温度对土壤表观热导率的影响十分明显。在该文实验条件下,当土壤饱和度大于25%时,土壤表观热导率开始明显高于常温值,并在40%(细砂)和50%(粉粘)饱和度附近出现峰值。此现象与含湿土壤孔隙中的水蒸气强化扩散作用密切相关。在实验数据基础上,回归水蒸气运移增强因子的计算参数,可为高温土壤热湿迁移过程建模提供一定的指导作用。
The apparent thermal conductivities of two types of soils under high temperature were measured using the micro-probes. The results showed that temperature had a great impact on apparent thermal conductivity of soils. When the soil saturation exceeded 25% , its apparent thermal conductivity under high temperatures became higher than that under room temperatures, and reached a peak about the saturation range of 40% for fine sand and 50% for silt clay, respectively. This phenomenon was explained by the enhanced thermal vapor diffusion theory. Finally, the new parameters were regressed to calculate the enhancement factor of thermal vapor diffusion process, which could be helpful for modelling the heat and moisture migration in soils under high temperature boundary conditions.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2013年第8期1385-1390,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50906020)
中低温热能高效利用教育部重点实验室开放基金(201301-101)
关键词
土壤
表观热导率
潜热
水蒸气热扩散
增强因子
soil
apparent thermal conductivity
latent heat
thermal vapor diffusion
enhancement factor
