Transient modeling of non-isothermal, dispersed two-phase flow in natural gas pipelines

Abbaspour, Mohammad; Chapman, Kirby S.; Glasgow, Larry A.

doi:10.1016/j.apm.2009.06.023

Cited by 24 publications

(14 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pro cedure can be found in the article by Luskin [9]. Using the cen tered difference method for the spatial derivatives the discretized equations become (18) and the individual terms by…”

Section: Implicit Cell Centeredmentioning

confidence: 99%

See 1 more Smart Citation

Transient Flow in Natural Gas Pipelines Using Implicit Finite Difference Schemes

Helgaker

Müller

Ytrehus

2014

Journal of Offshore Mechanics and Arctic Engineering

View full text Add to dashboard Cite

Transmission o f natural gas through high pressure pipelines has been modeled by numerically solving the governing equations fo r one-dimensional compressible flow using implicit finite difference methods. In the first case the backward Euler method is consid ered using both standard first-order upwind and second-order centered differences fo r the spatial derivatives. The first-order upwind approximation, which is a one-sided approximation, is found to be unstable fo r CFL numbers less than 1, while the centered difference approximation is stable fo r any CFL number. In the second case a cell cen tered method is considered where flow values are calculated at the midpoint between grid points. This method is also stable fo r any CFL number. However, fo r a discontinuous change in inlet temperature, the method is observed to introduce unphysical oscillations in the temperature profile along the pipeline. A solution strategy where the hydraulic and thermal models are solved separately using different discretization techniques is sug gested. Such a solution strategy does not introduce unphysical oscillations fo r discontinu ous changes in inlet boundary conditions and is found to be stable fo r any CFL number. The one-dimensional flow model is validated using operational data from a high pressure natural gas pipeline.

show abstract

Section: Implicit Cell Centeredmentioning

confidence: 99%

“…These oscillations were also observed to affect the mass flow rate along the pipeline. Modisette [17] discretizes the governing equations in the same way as in several other recent articles on transient gas flow in high pressure pipelines [5,6,8,18].…”

Section: Introductionmentioning

confidence: 99%

Transient Flow in Natural Gas Pipelines Using Implicit Finite Difference Schemes

Helgaker

Müller

Ytrehus

2014

Journal of Offshore Mechanics and Arctic Engineering

View full text Add to dashboard Cite

show abstract

“…Cengel and Cimbala [15] calculated the relationship between pressure loss and mass flow in a pneumatic system and proposed that the resistance of the pneumatic system is proportional to the length of the pipe and the aerodynamic viscosity. Mohammad [16], based on the two-fluid conservation equation, established a homogeneous two-phase gas pipe model to accurately calculate the transient changes of the natural gas pipe system.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

A New Calculating Method of Pressure Response Time of Pneumatic Brake Pipe Based on Experiments

Yang

et al. 2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Air brake system is one of the common braking methods for buses and trucks; its excellent performance guarantees the safety of the vehicle and the stability of the braking. As an important part of the pneumatic brake system, the brake pipe is an important factor influencing the pressure response time of the pneumatic brake system. Based on the exploratory experiment of pneumatic brake pipe, the influence of pipe length, pipe diameter, inlet sonic conductance, initial pressure, and supply pressure on pipe pressure response time was analyzed by fuzzy gray correlation analysis method. The results show that tube length is the most important factor affecting the pressure response time. Combined with the analysis results of gray correlation degree, the experimental scheme of the response time of the pneumatic brake pipe was designed by the response surface experimental design method. Based on the multiparameter analysis method, the influence of the experimental parameters on the pipe pressure response time was analyzed. Based on the experimental data, the form of calculation formula is derived by dimension analysis method, which provides a theoretical basis for the selection of pneumatic brake pipes and the design of air brake system.

show abstract

“…The condensate would attach to the pipe wall as a form of film or droplet [9,10]. The condensation will decrease the effective cross-sectional area and cause the increase of pressure drop which may lead to system shutdown [11,16]. Generally, the condensed water accumulates at the lower parts of the pipeline due to the hilly pipeline route topography, which results in a continuous change of liquid holdup along the pipeline [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The changing liquid holdup and flow area are bounded to affect the flow patterns which inevitably influence the operating pressure and temperature inversely. Thus, the flow of condensed water and water-bearing gas in production pipelines is a complex process with coupling of hydraulic, thermal, and phase change phenomena [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Gas-Liquid Stratified Flow in Pipeline with Phase Change

He¹,

Li²,

Wang³

et al. 2018

Heat Transfer - Models, Methods and Applications

View full text Add to dashboard Cite

When the natural gas with vapor is flowing in production pipeline, condensation occurs and leads to serious problems such as condensed liquid accumulation, pressure and flow rate fluctuations, and pipeline blockage. This chapter aims at studying phase change of vapor and liquid-level change during the condensing process of water-bearing natural gas characterized by coupled hydrothermal transition and phase change process. A hydrothermal mass transfer coupling model is established. The bipolar coordinate system is utilized to obtain a rectangular calculation domain. An adaptive meshing method is developed to automatically refine the grid near the gas-liquid interface. During phase change process, the temperature drop along the pipe leads to the reduction of gas mass flow rate and the rise of liquid level, which results in further pressure drop. Latent heat is released during the vapor condensing process which slows down the temperature drop. Larger temperature drop results in bigger liquid holdup while larger pressure drop causes smaller liquid holdup. The value of velocity with phase change is smaller than that without phase change while the temperature with phase change is bigger. The highest temperature locates in gas phase. But near the pipe wall the temperature of liquid region is higher than gas region.

show abstract

Transient modeling of non-isothermal, dispersed two-phase flow in natural gas pipelines

Cited by 24 publications

References 7 publications

Transient Flow in Natural Gas Pipelines Using Implicit Finite Difference Schemes

Transient Flow in Natural Gas Pipelines Using Implicit Finite Difference Schemes

A New Calculating Method of Pressure Response Time of Pneumatic Brake Pipe Based on Experiments

Gas-Liquid Stratified Flow in Pipeline with Phase Change

Contact Info

Product

Resources

About