含水砂土导热系数实验研究  

Experimental Study of the Thermal Conductivity of Sand With Different Moisture Content

作　　者：周媛媛[1] 江海峰[1] 李辉[1] 刘志颖[1] 王琥[1] 田冉[1] 史琳[1] 

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2015年第2期265-268,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51236004)

摘　　要：对含水砂土导热系数随含水率变化规律的实验研究是进行地源热泵系统设计的基础,本文制备了五类不同粒径,不同含水率的砂样及八类混合砂样,测试了其热导率随含水率的变化规律,并拟合了混合砂样的热导率曲线,结果表明:对于五类不同粒径的砂样及八类混合砂样,热导率均随含水率的增加而增大,而粒径对于热导率影响不大,在低水分含量(ω<15%)条件下,混合砂样拟合曲线与实验值吻合较好。The experimental study concerns the variation of the thermal conductivity of sand with the change of moisture content,which is the basis for ground source heat pump system design.The study examines the thermal conductivity variation of 5 sand samples and the comparison of empirical curves and fitting curves of eight mixtures.The result shows that:for all the sand samples,the thermal conductivity increases with the increase of the moisture content,while the size of the sand samples has little effect of the thermal conductivity.At low moisture content(w < 15%),the fitting curves of eight mixtures are in good agreement with the empirical curves.

关 键 词：砂样 导热系数 含水率 

分 类 号：TU411[建筑科学—岩土工程]