Evaluating the Effective Friction Factor and Overall Heat Transfer Coefficient During Unsteady Pipeline Operation

Price, G. R.; McBrien, R. K.; Rizopoulos, Sandy; Golshan, H.

doi:10.1115/1.2830078

Cited by 9 publications

(5 citation statements)

References 8 publications

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“…, Thorley and Tiley[45] and Price et al[63] evolved the basic equations for one-dimensional, transient, compressible flow, comprising the effects of wall friction and heat transfer. Some previous researchers had neglected the convective term in the momentum equation, which resulted in a loss of accuracy in results of natural gas transient flow in pipelines.…”

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confidence: 99%

Numerical Simulation of Natural Gas Pipeline Transients

Alghlam

Stevanović

Elgazdori³

et al. 2019

Journal of Energy Resources Technology

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Simulations of natural gas pipeline transients provide an insight into a pipeline capacity to deliver gas to consumers or to accumulate gas from source wells during various abnormal conditions and under variable consumption rates. This information is used for the control of gas pressure and for planning repairs in a timely manner. Therefore, a numerical model and a computer code have been developed for the simulation of natural gas transients in pipelines. The developed approach is validated by simulations of test cases from the open literature. Detailed analyses of both slow and fast gas flow transients are presented. Afterward, the code is applied to the simulation of transients in a long natural gas transmission pipeline. The simulated scenarios cover common operating conditions and abrupt disturbances. The simulations of the abnormal conditions show a significant accumulation capacity and inertia of the gas within the pipeline, which enables gas packing and consumers supply during the day time period. Since the numerical results are obtained under isothermal gas transient conditions, an analytical method for the evaluation of the difference between isothermal and nonisothermal predictions is derived. It is concluded that the nonisothermal transient effects can be neglected in engineering predictions of natural gas packing in long pipelines during several hours. The prescribed isothermal temperature should be a few degrees higher than the soil temperature due to the heat generation by friction on the pipelines wall and heat transfer from the gas to the surrounding soil.

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mentioning

confidence: 99%

Numerical Simulation of Natural Gas Pipeline Transients

Alghlam

Stevanović

Elgazdori³

et al. 2019

Journal of Energy Resources Technology

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“…That system is obtained from (3), where the term   2 wx    is rejected as negligible. In [16][17][18], the system of partial differential equations is approximated by a model with lumped parameters. In [17], the effect of information uncertainty on the results of optimization procedures is investigated, the degree of closeness of the calculated and actual regimes on the upcoming daily functioning cycle is estimated.…”

Section: Review Of Publications On Topicmentioning

confidence: 99%

“…In [18], partial differential system is reduced ultimately to an algebraic system resembling a mathematical model of an electric power network. A very efficient model with lumped parameters was proposed in [19][20], where the parabolic system was taken as the basis for the approximation.…”

Section: Review Of Publications On Topicmentioning

confidence: 99%

Phenomenological study of the dynamics of pressure distribution in a gas flow in a long-distance pipeline

Sukharev

Kochueva

2019

E3S Web Conf.

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The paper is devoted to the modeling of unsteady gas flows in long pipelines. A widely used flow model in the form of a system of partial differential equations obtained by the methods of continuum mechanics is considered. The simplifying assumptions under which it is derived are discussed. It is stated that there is no experimental confirmation of the admissibility of these simplifications. Wave processes observed during the operation of the object are examined. The velocity of pressure waves propagation and attenuation was estimated, some physical phenomena, the causes of which are not clear from the available information, were identified. Actual observations are reconciled with the results of model calculations, some discrepancies between them are detected.

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“…The results reported in [5] show the importance of modelling the non-isothermal effects of gas flow. It was also shown that the convective inertia term plays an important role in the gas flow analysis and cannot be neglected.Price et al [6] presented a method for the determination of effective friction factor and overall heat transfer coefficient for a high-pressure natural gas pipeline under transient flow conditions. The predicted pipeline outlet pressure and temperature in [6] are in good agreement with measured pipeline data.…”

Section: Introductionmentioning

confidence: 99%

“…It was also shown that the convective inertia term plays an important role in the gas flow analysis and cannot be neglected.Price et al [6] presented a method for the determination of effective friction factor and overall heat transfer coefficient for a high-pressure natural gas pipeline under transient flow conditions. The predicted pipeline outlet pressure and temperature in [6] are in good agreement with measured pipeline data. Osiadacz and Chaczykowski [7] calculated the temperature of the gas along the pipeline by solving the energy equation.…”

Section: Introductionmentioning

confidence: 99%

Influence of wall friction on flow parameters in natural gas transmission pipeline

Alghlam¹,

Alghlam²,

Stevanović

2022

Therm sci

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A mathematical model and computational algorithm are derived for the prediction of natural gas pipeline flow. Non-isothermal and compressible steady state flow is considered. Heat transfer between gas flow and surroundings is taken into account together with the heat generation due to the gas friction on the inner pipeline wall. The computational algorithm is based on the marching procedure with defined initial conditions. The predicted thermal effect of the wall friction is validated by the simulation of a case that is available in the open literature. The influence of heat generation by gas wall friction in the long transmission pipeline on gas pressure and temperature is evaluated. Differences between results obtained with and without the heat generation due to gas wall friction are analysed. The heat generation due to gas friction on the pipeline inner wall has an influence on the gas temperature change along the pipeline, while its influence on the pressure drop is negligible. These detailed results are novel since most of the previously published results on non-isothermal gas flow did not take into account the thermal effect of the gas wall friction or the influence of this effect was not evaluated. The presented results are a support to the gas pipeline design methods and operational analyses.

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Evaluating the Effective Friction Factor and Overall Heat Transfer Coefficient During Unsteady Pipeline Operation

Cited by 9 publications

References 8 publications

Numerical Simulation of Natural Gas Pipeline Transients

Numerical Simulation of Natural Gas Pipeline Transients

Phenomenological study of the dynamics of pressure distribution in a gas flow in a long-distance pipeline

Influence of wall friction on flow parameters in natural gas transmission pipeline

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