A Numerical Calculation on Soil Moisture and Heat Couple Temperature Field around Pipelines in the Process of Alternate Transportation of Cool-Hot Crude Oil

For increasing the accuracy of estimate, numerically calculate the temperature field of soil around pipeline should consider multiple factors influence, such as climatic change, the depth of the buried pipeline, moisture transfer, ice-water phase change etc. The temperature field of soil around underground pipeline in the process of cool and hot crude oil alternately transportation is numerically simulated through using finite elements method. The effect of moisture transfer and phase change on temperature was taken into consideration. The temperature distributions of soil around pipeline and oil within pipeline at different time are obtained. The contrast analysis the calculation results between using water and heat couple model and using heat transfer model, show that the heat retention in soil have great effect on oil within pipeline and the moisture transfer and phase change have definite effect on heat transfer of the soil. In order to get approach actual results, they should be considered in calculation.