Numerical Simulation for Soil Temperature Field of Buried Oil Pipeline Considering Effects of Moisture

According to coupled moisture and heat model, mathematical model and its control equation for soil temperature field of buried oil pipeline are put forward.Numerical simulation and analysis on soil heat transfer considering moisture impact is carried out with finite element method.Through comparison on calculation results without considering soil moisture, it is found out that temperature gradient of soil around the buried pipeline is greater, thermal conductivity of wet soil is higher than that of dry soil.First, soil thermal conductivity is increased with the increase of initial moisture, and then soil thermal conductivity is continuously decreased with the increase of the soil thermal conductivity when initial moisture is maximized