含水率对土壤热物性参数影响的试验研究  

Experiment Study of Soil Thermal Properties with Different Water Content

作　　者：皇甫红旺 晋华[2] HUANG FU Hong-wang JIN Hua(Xinzhou City Office of Water Resources Management Committee, Xinzhou 034000,Shanxi Province, China College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan 030024,China)

机构地区：[1]忻州市水资源管理委员会办公室,山西忻州034000 [2]太原理工大学水利科学与工程学院,太原030024

出　　处：《节水灌溉》2016年第10期55-58,共4页Water Saving Irrigation

基　　金：国家自然科学基金项目"土壤源热泵条件下非饱和/饱和带水热迁移规律研究"(41372247)

摘　　要：土壤的导热系数、比热容和热扩散系数是表征其传热和蓄热的最重要热物性参数,是土壤热性质研究的重要内容。基于准稳态导热理论的平板仪法,对常用沙土的上述3种热物性参数进行了实验研究。结果表明:在土样未到达饱和状态时,导热系数、比热容、热扩散系数均随含水率的增加而增加,从含水率为0%增加到5%时的增幅最大。导热系数和热扩散系数随土壤质地类别和含水率的变化而变化,比热容的大小主要随含水率的变化而变化。平板仪测出的导热系数较热探针测出的值略微偏大,但两种方法测出的误差小于5%的数据占总数的97%,两种方法对土壤的应用等效。The thermal conductivity, specific heat capacity and thermal diffusivity, as the most important parameters of heat transfer and heat storage, are important in studying the thermal properties of soil. In this paper, the experimental tests of sand were per formed for the parameters mentioned by the plate method based on the quasi steady heat conduction theory. The results showed that, for unsaturated soil, the three parameters all increase with the increase of water content, and the maximum increase amplitude oc- curred in the water content of 0% to 5%. The variation of thermal conductivity and thermal diffusivity are influenced by soil of tex ture, type and water content, and the specific heat capacity are controlled by the soil water content. The thermal conductivities meas- ured by the plate method are slightly larger than the value measured by the thermal probe. For the two methods above, the measured data of error is less than 5% for 97% of the total data tested, and two kinds of testing methods are equivalent.

关 键 词：含水率 导热系数 比热容 热扩散系数 平板法 

分 类 号：S15[农业科学—土壤学] TU443[农业科学—农业基础科学]