加热条件下土壤水分迁移规律的数值模拟研究

摘要

通过数值计算的方法，应用CFD软件对土壤源地源热泵地埋管换热器进行了一维数值模拟，在模拟过程中，除将土壤作为多孔介质外，同时考虑土壤中水分迁移的影响，研究不同入口温度、不同入口流速、不同含水量对水分迁移的影响，结果表明，在不考虑水分相态变化的情况下，由于加热导致土壤温度升高引起土壤中水分发生迁移，在近壁面处水分迁移的变化较明显，距离加热区域较远处水分迁移的变化较小。%In this paper, with the software of CFD, one dimensional simulation of the heat exchanger in ground source heat pump were conducted. Besides regarding the soil as the porous medium, the water transfer in the soil was considered, in the condition of different temperature, velocity and water content. The results shown that in the higher temperature zone, the concentration of water was lower than the one in the lower temperature when the state of the water was neglected.