Numerical Simulation of Soil Temperature Field Surrounding Underground Heat Pipe in Permafrost Region

2010 ◽  
pp. 70-76
Author(s):  
Jianjun LIU ◽  
Lijun LIN ◽  
Guihong PEI
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Soil Temperature ◽  
Heat Pipe ◽  
Permafrost Region

Heat Transfer Model and Analysis of Oil-Immersed Electrical Transformers with Heat Pipe Radiator

2012 ◽  
Vol 516-517 ◽  
pp. 312-315
Author(s):  
Guang Hua Li ◽  
Hong Lei Liu ◽  
De Jian Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Temperature Field ◽  
Heat Pipe ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Cooling Device ◽  
Transformer Design ◽  
Electrical Transformers ◽  
Good Agreement

This paper has formulated a heat transfer model for analyzing the cooling properties of a heat pipe cooling device of oil-immersed electrical transformer. Based on the model, the oil temperature field of a 30 KVA oil-immersed transformer has been numerical simulated, and experiments also had been conducted. Results showed that the numerical simulation has good agreement with experiment results. Results also showed that heat pipe radiator is feasible for oil-immersed electrical transformer cooling. The model can be used to analyze the oil temperature distribution properties in an oil-immersed electrical transformer with heat pipe cooling device, and provide theoretical guide for transformer design and improvement.

Numerical Simulation Analysis of Temperature Field on Tympanites Roadbed

2013 ◽  
Vol 838-841 ◽  
pp. 1291-1294
Author(s):  
Jian Yi Yuan ◽  
Chun Feng Wang ◽  
Jian Hua Cheng ◽  
Ding Bang Zhang ◽  
Zhen Hua Wu
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Physical Model ◽  
Simulation Analysis ◽  
Frozen Soil ◽  
Permafrost Region ◽  
Key Points ◽  
Calculating Model

The physical model and calculating model of temperature field are founded according to the founded controlling equation. By simulating the changing progress of climate features, the temperature field of roadbed in permafrost region in different season was obtained. And some results are got by analyzing the diversity of temperature of key points. The last, the technology assumption of effectively controlling tympanites which combines replacing part frozen soil and resisting highway tympanites structure is brought up.

Numerical Simulation of Crude Pipeline Using Moisture-Heat Coupled Thermal Equation

2011 ◽  
Vol 268-270 ◽  
pp. 154-159 ◽  
Author(s):  
Bo Xu ◽  
Xiang Dong Xue ◽  
Zhi Qiang Yao ◽  
Long Wang ◽  
De Ji Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Soil Temperature ◽  
Governing Equation ◽  
Safety Evaluation ◽  
Iteration Algorithm ◽  
Accurate Information ◽  
Fluid Temperature ◽  
Thermal Equation ◽  
Non Linear Equation

Temperature plot is crucially important for numerical simulation of high waxy crude pipeline because of its non-Newtonian behavior at low temperature. As the fluid temperature drops below than the wax appearance temperature, the viscosity of the crude increases dramatically. Thus the needed pressure has a possibility to reach the maximum allowable pressure and cause a potential risk for the pipeline itself. To avoid this, numerical simulation of the temperature plot along the pipeline is necessary in order to obtain accurate information. However, as the temperature governing equation is a non-linear equation and the soil temperature field is also being involved. It is required to solve the surrounded soil temperature field. In the paper, the governing equation for one dimensional crude pipeline and the new moisture-heat equation for the soil (porous medium) are presented and the iteration algorithm to solve this coupled equation is given. With the algorithm and the coupled heat-moisture equations, the numerical results are obtained and have a very precise coincidence with the experimental results. Then a reliability based method is used to evaluate the flow safety of one pipeline in China. With the presented model and obtained results, the flow safety evaluation results show that the safety of the crude pipeline is assured in the test cases.

NUMERICAL SIMULATION OF PULSATING HEAT PIPE WITH SURFACTANT SOLUTIONS

2018 ◽  
Author(s):  
Durga Bastakoti ◽  
Hongna Zhang ◽  
Wei-Hua Cai ◽  
Feng-Chen Li
Keyword(s):  
Numerical Simulation ◽  
Heat Pipe ◽  
Pulsating Heat Pipe ◽  
Surfactant Solutions

Numerical Simulation of the Thermal Performance of a Nanofluid-Filled Heat Pipe

2015 ◽  
Vol 37 (2) ◽  
pp. 220-231 ◽  
Author(s):  
Mohammad Hasan Shojaeefard ◽  
Javad Zare ◽  
Mojtaba Tahani
Keyword(s):  
Numerical Simulation ◽  
Heat Pipe ◽  
Thermal Performance

Analysis the Influence of the Thermal Diffusivity of the Soil around Buried Pipe on Soil Physical Property

2013 ◽  
Vol 805-806 ◽  
pp. 552-556
Author(s):  
Ying Xu ◽  
Xiao Yan Liu
Keyword(s):  
Temperature Field ◽  
Thermal Diffusivity ◽  
Soil Temperature ◽  
Temperature Drop ◽  
Physical Property ◽  
Field Soil ◽  
Buried Pipeline ◽  
Buried Pipe ◽  
Soil Physical Property ◽  
Natural Temperature

In chilliness area, the temperature drop of oil in buried pipeline is affected by soil temperature field, and the thermal diffusivity is one of the main of physical property the soil, which affects the temperature drop of oil directly. This paper introduced the test principle of the thermal diffusivity of soil, and researched the influence of thermal diffusivity of soil on the soil physical property, such as soil natural temperature field, soil frozen days, depth of freezing and temperature delay, which can offer theory support for the calculation of hot oil temperature drop in buried pipeline.

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