Modeling of incompressible flow in short pipes with leaks

Molina-Espinosa, L.; Cazarez-Candia, O.; Verde-Rodarte, Cristina

doi:10.1016/j.petrol.2013.08.007

Cited by 26 publications

(15 citation statements)

References 11 publications

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“…2(b). Lower pressure at upstream and higher pressure at downstream of the leak lead to positive magnitude of the pressure change at the vicinity of leak location, consistent with the experimental results results (Molina-Espinosa et al, 2013). The increase in pressure after leak is promoted by decreasing the downstream flow rate and kinetic energy due to leak.…”

Section: Fig 9 Static Pressure Variation Curves Along Centerlines Asupporting

confidence: 89%

“…Lower pressure at the upstream but higher pressure at the downstream of the leak can be observed, which is due to lower flow velocity downstream resulted from leak. The trend is consistent with the reference simulation results(Ben-Mansour et al, 2012) and experimental data(Molina-Espinosa et al, 2013).…”

supporting

confidence: 91%

“…A straight pipe with water as working fluid is considered in the present study, while the leakage is performed by a discharge pipe to atmosphere. All the dimensions and boundary conditions were set the same as the experimental work (Molina-Espinosa et al, 2013), which has been illustrated in our previous study (Zeng and Luo, 2017). The fluid domain of the main and discharge pipes is shown in Fig.…”

Section: Model Configuration and Computational Methodsmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

“…Several cases in the experimental work (Molina- Espinosa et al, 2013) were selected to validate the present CFD modelling. The pressure drop at the two locations (z1=0.05m and z2=1.5m from the inlet) and the leak mass quantity between the present simulation and the reference experimental data (Molina-Espinosa et al, 2013) are compared and listed in Table 3, which has been shown in the previous study (Zeng and Luo, 2017). The deviation between CFD and experimental data is within the range of 3.88% -31.38%, with the smallest difference for middle leakage mass quantity ratio of 17% and the largest difference for small leak mass quantity of 8%, which is reasonable because it is more difficult to capture small leak mass quantity by both experiments and simulations due to uncertainty in experiments and computation error in simulations.…”

Section: Model Validationmentioning

confidence: 99%

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Numerical Analysis on Pipeline Leakage Characteristics for Incompressible Flow

Zeng¹,

Luo²

2019

JAFM

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Systematic Computational Fluid Dynamics (CFD) simulations on incompressible water pipe flow with leakage were conducted in the present study. The aim is to provide the understanding of how different parameters, including the leakage pipe diameter, inlet mass flow rate, and main pipe length, affect the flow phenomena at the vicinity of the leakage location. The present CFD data show that the leakage pipe diameter has dominant effect on the leak mass quantity, pressure change at the vicinity of leak location, total pressure drop and pressure gradient along the main pipe. The effects of both inlet mass flow rate and the main pipe length on leak mass quantity are comparably important. Due to existence of the leakage pipe, larger velocity but lower pressure at upstream, and lower velocity but larger pressure at downstream occur at the vicinity of leakage, which causes adverse pressure at this region. The pressure change resulted from the adverse pressure increases approximately linear with the leak size ratio (ratio of leakage pipe diameter to main pipe diameter) when it is smaller than approximately 40%, at which the maximum pressure change at the leak location occurs. When the leak size ratio is smaller than approximately 5%, the pressure change at the leak location is seen to be approximately zero, implying negligible pressure difference at the two boundary points of leakage pipe. There is sudden change in the pressure gradient along the flow direction at the leak location, which results from a local pressure increase there. When farther away from the leakage, the magnitude of the maximum pressure gradient along the flow direction is reduced due to attenuation of leakage effect. The present study proves that CFD analysis could be an effective and less-costly way to investigate pipe flow with leakage, so as to provide scientific understanding of the physics on pipe flows with leakage.

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Section: Fig 9 Static Pressure Variation Curves Along Centerlines Asupporting

confidence: 89%

supporting

confidence: 91%

Section: Model Configuration and Computational Methodsmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

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