| Pipeline,as one of the most popular transportation equipment, has its particular advantages in transporting liquid, gas and serum. With the development of pipeline transportation, the increase of amount and age, the unexpected erosion, abrasion and disfigurement by natural or artificial reasons, the accident of leak becomes more and more frequent, result in serious economic losses and social impacts. So the study follows:1 Summering the current situation and development trend, the heat transfer of buried pipeline was analyzed in the paper. Physical and mathematical models of steady temperature field were established, which may be the initial condition for leakage.2 Porous soil properties and transportation way were studied. Darcy rule, a feasible model was used to simplify the porous. Dues to the multiphase flow and their transportation, three-area multiphase model were established for simple and precise calculation.3 Based on above, Physical model of leak temperature field was established, contact with the seepage and porous, the reasonable boundary condition was given for three and two dimension math model.4 Simulated the leakage temperature field. Known for comparing with the experimental data, the model is rationality. Using in the fact, and got the field distribution rule and provide the theory reference and guide for new infrared detection technology.5 Considering the soil frozen in severely cold area, simulation model is established in two coordinates according to heat transfer of water or ice phase change in oil. Phase change considered and not is simulated under soil frozen condition, and summary the rule for buried pipeline leakage, which can be reference for simulation and detection of buried pipeline.Some qualitative and quantity conclusions are acquired in this paper, which is helpful in detecting earlier and the real-time examination of the buried pipelines. The models established in this paper, which can be used in different areas and actual conditions are general.
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