地埋管周围土壤冻结传热特性的实验研究

Experimental Study on Heat Transfer Characteristics of Frozen Soil around Buried Pipes

本文通过搭建沙箱实验平台模拟地埋管低温取热过程,采用控制变量法研究含水率和管内流体温度对地埋管周围土壤冻结传热的影响,并对实验结果进行分析和数值拟合。实验结果表明:随着含水率的增加或管内流体温度降低,土壤冻结区厚度增加,冻结区土壤温度降低,传热速率加快,而且管内流体温度降低对土壤冻结的影响更大,管内流体温度对冻结边界层和土壤温度的影响比含水率分别大32.57%和11.62%。

A sandbox experiment platform was built to simulate the low temperature heat removal process of buried pipes.The effects of moisture content and fluid temperature on soil freezing heat transfer around buried pipe were studied by using control variable method.The experimental results were analyzed and fitted by numerical simulation.Experimental results show that the thickness of soil freezing zone increases,the soil temperature in freezing zone decreases,and the heat transfer rate increases with the increase of moisture content or the decrease of fluid temperature in the pipe.In addition,the effect of soil freezing is greater when the temperature of fluid in the pipe decreases.The effect of fluid temperature on frozen boundary layer and soil temperature was 32.57%and 11.62%,respectively.