An investigation of transition processes from transient gas–liquid plug to slug flow in horizontal pipe: Experiment and Cost-based recurrence analysis

Zhai, Lusheng; Yang, Jie; Wang, Yuqing

doi:10.1016/j.nucengdes.2021.111253

Cited by 6 publications

(2 citation statements)

References 53 publications

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“…Due to energy dissipation, the increase of oil momentum is not equal to the increase of internal energy after bubble forcing, and the energy of bubble forcing comes from pressure fluctuation. Therefore, the actual pressure fluctuation value is obviously lower than that without gas, and the size of the pressure wave mainly depends on the gas content [36][37][38].…”

Section: Resultsmentioning

confidence: 99%

Establishment and Solution of Four Variable Water Hammer Mathematical Model for Conveying Pipe

Duan

Jin³

2022

Energies

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Transient flow in pipe is a much debated topic in the field of hydrodynamics. The water hammer effect caused by instantaneous valve closing is an important branch of transient flow. At present, the fluid density is regarded as a constant in the study of the water hammer effect in pipe. When there is gas in the pipe, the variation range of density is large, and the pressure-wave velocity should also change continuously along the pipe. This study considers the interaction between pipeline fluid motion and water hammer wave propagation based on the essence of water hammer, with the pressure, velocity, density and overflow area set as variables. A new set of water hammer calculation equations was deduced and solved numerically. The effects of different valve closing time, flow rate and gas content on pressure distribution and the water hammer effect were studied. It was found that with the increase in valve closing time, the maximum fluctuating pressure at the pipe end decreased, and the time of peak value also lagged behind. When the valve closing time increased from 5 s to 25 s, the difference in water hammer pressure was 0.72 MPa, and the difference in velocity fluctuation amplitude was 0.076 m/s. The findings confirm: the greater the flow, the greater the pressure change at the pipe end; the faster the speed change, the more obvious the water hammer effect. High-volume flows were greatly disturbed by instantaneous obstacles such as valve closing. With the increase of time, the pressure fluctuation gradually attenuated along the pipe length. The place with the greatest water hammer effect was near the valve. Under the coupling effect of time and tube length, the shorter the time and the shorter the tube length, the more obvious the pressure fluctuation. Findings also confirm: the larger the gas content, the smaller the fluctuation peak of pipe end pressure; the longer the water hammer cycle, the smaller the pressure-wave velocity. The actual pressure fluctuation value was obviously lower than that without gas, and the size of the pressure wave mainly depended on the gas content. When the gas content increased from 1% to 9%, the difference of water hammer pressure was 0.41 MPa.

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Section: Resultsmentioning

confidence: 99%

Establishment and Solution of Four Variable Water Hammer Mathematical Model for Conveying Pipe

Duan

Jin³

2022

Energies

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“…The mixed flowing of gas and water in pipes yields typical gas-liquid two-phase flows, which are widely present in the fields of petroleum, 1 biology, 2 hydraulics, 3 chemical, 4 energy, 5 and so on. Understanding the morphological characteristics of the two immiscible phases, which are known as flow patterns, is of great Chaos ARTICLE scitation.org/journal/cha importance for the design of the flowing control system.…”

Section: Introductionmentioning

confidence: 99%

Interconnected ordinal pattern complex network for characterizing the spatial coupling behavior of gas–liquid two-phase flow

Wei

et al. 2023

Chaos: An Interdisciplinary Journal of Nonlinear Science

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The complex phase interactions of the two-phase flow are a key factor in understanding the flow pattern evolutional mechanisms, yet these complex flow behaviors have not been well understood. In this paper, we employ a series of gas–liquid two-phase flow multivariate fluctuation signals as observations and propose a novel interconnected ordinal pattern network to investigate the spatial coupling behaviors of the gas–liquid two-phase flow patterns. In addition, we use two network indices, which are the global subnetwork mutual information (I) and the global subnetwork clustering coefficient (C), to quantitatively measure the spatial coupling strength of different gas–liquid flow patterns. The gas–liquid two-phase flow pattern evolutionary behaviors are further characterized by calculating the two proposed coupling indices under different flow conditions. The proposed interconnected ordinal pattern network provides a novel tool for a deeper understanding of the evolutional mechanisms of the multi-phase flow system, and it can also be used to investigate the coupling behaviors of other complex systems with multiple observations.

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Transient flow dynamics behaviors during quick shut-off of ball valves in liquid hydrogen pipelines and storage systems

Shu,

Liang,

Qin

et al. 2023

Journal of Energy Storage

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An investigation of transition processes from transient gas–liquid plug to slug flow in horizontal pipe: Experiment and Cost-based recurrence analysis

Cited by 6 publications

References 53 publications

Establishment and Solution of Four Variable Water Hammer Mathematical Model for Conveying Pipe

Establishment and Solution of Four Variable Water Hammer Mathematical Model for Conveying Pipe

Interconnected ordinal pattern complex network for characterizing the spatial coupling behavior of gas–liquid two-phase flow

Transient flow dynamics behaviors during quick shut-off of ball valves in liquid hydrogen pipelines and storage systems

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