Numerical study of heat transfer from an offshore buried pipeline under steady-periodic thermal boundary conditions

Barletta, Antonio; Zanchini, Enzo; Lazzari, Stefano; Terenzi, Alessandro

doi:10.1016/j.applthermaleng.2007.08.004

Cited by 26 publications

(17 citation statements)

References 4 publications

(2 reference statements)

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“…Sum up the whole weighted residuals of every element and make it be zero, as expressed by Equation (36). Thus the differential equations of unsteady heat transfer can be expressed in the matrix form of Equation (37). The backward difference is used to discretize Equation (37) for obtaining the temperature of pipe walls and subsea mud in the next time step.…”

Section: Fem For Solving the Heat Transfer Equations Of Pipe Walls Anmentioning

confidence: 99%

“…There is relatively less corresponding research on preheating submarine hot oil pipelines. For submarine pipelines, Barletta [37] transformed the unsteady two-dimensional heat conduction equations into a steady dimensionless form. Solving by FEM software numerically, the rule of heat loss under periodic thermal boundary conditions was performed.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation for Preheating New Submarine Hot Oil Pipelines

et al. 2019

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For new submarine hot oil pipelines, accurate simulation of preheating is difficult owing to complex transient flow and coupled heat transfer happening. Using quasi-steady equations to simulate preheating is inadequate as the hydraulic transient phenomenon is neglected. Considering this fact, this paper constructs an unsteady flow and heat transfer coupled mathematical model for the preheating process. By combining the double method of characteristics (DMOC) and finite element method (FEM), a numerical methodology is proposed, namely, DMOC-FEM. Its accuracy is validated by field data collected from the Bohai sea, China, showing the mean absolute percentage error (MAPE) of 4.27%. Simulation results demonstrate that the preheating medium mainly warms submarine pipe walls rather than the surrounding subsea mud. Furthermore, during the preheating process, the equivalent overall heat transfer coefficients deduced performs more applicably than the inverse-calculation method in presenting the unsteady propagation of fluid temperature with time and distance. Finally, according to the comparison results of 11 preheating plans, subject to a rated heat power and maximum flow, the preheating parameter at a lower fluid temperature combined with a higher flow rate will produce a better preheating effect.

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Section: Fem For Solving the Heat Transfer Equations Of Pipe Walls Anmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation for Preheating New Submarine Hot Oil Pipelines

et al. 2019

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“…This method is frequently employed in pipeline simulations and industrial design. Barletta et al [17] compared this model with 2D heat transfer between offshore pipeline (completely buried in a seabed) and the surrounding environment in a steady-periodic regime. Their investigation showed that for burying depth above 1 m the approximate method underestimates the amplitude of the fluctuations of thermal power and predicts a wrong phase of these oscillations.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

Transient flow in natural gas pipeline – The effect of pipeline thermal model

Chaczykowski

2010

Applied Mathematical Modelling

125

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a b s t r a c tOne-dimensional, nonisothermal gas flow model was solved to simulate the slow and fast fluid transients, such as those typically found in high-pressure gas transmission pipelines. The results of the simulation were used to understand the effect of different pipeline thermal models on the flow rate, pressure and temperature in the pipeline. It was found that simplified flow model with steady-state heat transfer term overestimates the amplitude of the temperature fluctuations in the pipeline. This result indicated that unsteady heat transfer model with the effect of heat accumulation in the surroundings of the pipeline should be used to calculate the gas parameters at locations of interest within high-pressure gas transmission pipelines.

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“…Barletta et al [13], studied the steady periodic heat transfer of buried offshore pipelines numerically. The transient case is the annual temperature variation on the seabed in shallow water.…”

Section: 1mentioning

confidence: 99%

Modelling of Natural Gas Pipe Flow with Rapid Transients-case Study of Effect of Ambient Model

2015

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The paper presents a study of gas pipeline to soil heat transfer. The effect of simplifications of the heat transfer model is investigated. Studied are steady, one dimensional unsteady and two dimensional unsteady models of the pipe wall and soil. Flow conditions at the pipeline inlet are varied. The effects of rapid changes in gas mass flow rate and temperature at the pipeline inlet are studied. The case presented is representative for export natural gas pipelines, containing offshore and buried sections along the route. Results are compared to experimental data from an existing export natural gas pipeline.

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Numerical study of heat transfer from an offshore buried pipeline under steady-periodic thermal boundary conditions

Cited by 26 publications

References 4 publications

Numerical Simulation for Preheating New Submarine Hot Oil Pipelines

Numerical Simulation for Preheating New Submarine Hot Oil Pipelines

Transient flow in natural gas pipeline – The effect of pipeline thermal model

Modelling of Natural Gas Pipe Flow with Rapid Transients-case Study of Effect of Ambient Model

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