土壤一维渗流-传热耦合模型实验及数值模拟

One-dimensional Soil Model Test and Numerical Simulation of Coupled Seepage-heat Transfer Model

搭建了一维渗流-传热的模型实验台,研究渗流速度、方向对地埋管传热特性的影响。基于多孔介质传热与地下水流动理论,通过仿真模拟软件COMSOL Multiphysics建立了简化的三维数值模型,并将计算值与实测值进行对比验证。研究表明,地下水处于较低的渗流速度时,可忽略渗流的影响,处于较高的渗流速度时,渗流对传热起增强作用,其作用还随速度增加逐渐增大;渗流方向对中砂原温度场的影响在于热量的传递范围,当渗流背向热量传递方向时的传热范围较小,这可作为地埋管间距布置时的参考依据;经模拟验证,结果误差较小,所建立的物理模型较为可靠。

In this paper,a one-dimensional seepage-heat transfer model test-bed is built to study the influence of seepage velocity and direction on the heat transfer characteristics of buried pipes.Based on the theory of heat transfer in porous media and groundwater flow,a simplified three-dimensional numerical model was established through the simulation software COMSOL Multiphysics,and the calculated value was compared with the measured value to verify.The research shows that the effect of groundwater flow on the original medium-sand temperature field is as follows:at lower seepage velocity,the effect of seepage can be ignored,and at higher seepage velocity,seepage enhances heat transfer.And the higher the seepage velocity,the stronger the heat transfer effect.The influence of the seepage direction on the temperature field of the middle sand is the heat transfer range.When the seepage direction is opposite to the heat transfer direction,the heat transfer range is small,which can be used as a reference basis for the arrangement of buried pipes.After simulation verification,the result error is small,and the established physical model is relatively reliable.