Investigation on gas hydrate formation properties in a spiral flow using a flow loop

Rao, Yongchao; Sun, Yi; Wang, Shuli; Ge, Hao; Ding, Boyang; Yang, Mao

doi:10.1504/ijogct.2020.110388

Cited by 7 publications

(5 citation statements)

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“…They explicitly pointed out that the use of Kolmogorov entropy and information entropy could effectively identify flow regimes. After a large amount of experimental data analysis, it was concluded from Figure that the main flow patterns of gas–liquid two-phase flow in horizontal pipes equipped with/without internal inserts mainly include bubble flow, intermittent flow, and annular flow. − …”

Section: Introductionmentioning

confidence: 99%

Multiscale Turbulence Characteristics of Gas–Liquid Pressure Fluctuations in an Industrial Quatro Static Mixer

Yu,

Li,

Meng

et al. 2024

Ind. Eng. Chem. Res.

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The gas−liquid two-phase flow is of great significance to industrial production. The nonlinear turbulence characteristics of pressure fluctuation in a Quatro static mixer (QSM) are experimentally investigated under different superficial gas/liquid velocities to further study the flow characteristics of the gas−liquid two-phase. It is shown that there is a generalized self-similarity scaling law in the QSM, which is obtained by fitting the structure function of pressure fluctuation signals at different inlet and outlet flow velocities. Through self-similarity scaling law analysis, the scaling exponent parameters of the structure function of two-phase flow pressure fluctuation under apparent liquid velocity (U L ) = 0.028 m/s and different apparent gas velocities (U G ) in QSM are calculated. The calculation results show that the singular scaling exponent (γ) and intermittency parameter (β) are in the ranges of −0.142−0.311 and 0.286−0.966, respectively. This indicates that there exists an extended self-similarity scaling law in QSM under a low Reynolds number (Re). The R/S and autocorrelation analysis reveal that the detailed signals at the inlet and outlet have three similar flow behaviors, which consist of the liquid turbulence at the inlet, the bubble movement, breakup and coalescence, and the liquid swirling flow. The nonlinear analysis shows that flow in QSM presents a pseudohomogeneous flow pattern when the Hurst index (H) = 0.4−0.6, while it presents a heterogeneous flow pattern when H = 0.6−0.72. Support vector machine (SVM) and Random Forest models (RF) are utilized to better predict the flow pattern, with the recognition precision reaching 99.08 and 99.39%, respectively.

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Section: Introductionmentioning

confidence: 99%

Multiscale Turbulence Characteristics of Gas–Liquid Pressure Fluctuations in an Industrial Quatro Static Mixer

Yu,

Li,

Meng

et al. 2024

Ind. Eng. Chem. Res.

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“…However, the structure of the hydrocyclone is simple, and the internal flow field is relatively complicated. It is difficult for the experimental device to measure materials with opaque and high concentration . With the development of computational fluids, the numerical simulation method has become the mainstream method to study the performance of hydrocyclones, and the research on hydrocyclones whose structure will be improved by the numerical simulation method has also been affirmed by the industry.…”

Section: Introductionmentioning

confidence: 99%

“…It is difficult for the experimental device to measure materials with opaque and high concentration. 6 With the development of computational fluids, the numerical simulation method has become the mainstream method to study the performance of hydrocyclones, and the research on hydrocyclones whose structure will be improved by the numerical simulation method has also been affirmed by the industry. Xu et al 7 verified the accuracy of using the Reynolds stress model to simulate the particle motion of the hydrocyclone by comparing it with the particle motion trajectories in the particle image velocity (PIV) and used the Reynolds stress model to simulate the internal flow field of the hydrocyclone.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on the Flow Field and Separation Efficiency by Built-In Twisted Tape in the Hydrocyclone

Rao

Wang³

et al. 2023

ACS Omega

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Aiming at the separation of mud and sand in natural gas hydrate, for the designed built-in twisted tape hydrocyclone, the numerical simulation method was used to study the effects of different types of built-in twisted tape and operating conditions on the internal flow field of the hydrocyclone, separation efficiency, and influence of hydrate particle size distribution. The research results show that the built-in twisted tape has the same swirling direction as the hydrocyclone, which is beneficial to improving the swirling intensity, and the ability to carry and separate solid particles is obviously enhanced. The built-in twisted tape hydrocyclone with a length of 300 mm has better separation efficiency and internal flow field stability. By changing the conditions of the inlet velocity and the initial concentration of hydrate particles, the comparison shows that when the inlet velocity is 8 m/ s, the volume of mud and sand is 25%, the initial concentration of hydrate particles is 15%, and the built-in tape is 300 mm long. The tape hydrocyclone has the best separation efficiency. Compared with the basic hydrocyclone, the built-in twisted tape hydrocyclone with a length of 300 mm increases the separation efficiency of mud and sand by 7.49%, while the pressure drop only increases by 2.67%, showing the superiority of the built-in twisted tape structure.

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“…Fang et al 22 studied the flow characteristics of gas–liquid two-phase flow in a horizontal tube through a spiral vane by numerical simulation, and they carried out an experimental study of the nonintrusive measurement of phase separation and flow rate in the tube by trial-producing spiral vanes, and the error was controlled within 10%. Rao et al 23 performed an experiment on gas–liquid two-phase spiral flow with the addition of the surfactant SDBS using a self-built circular spiral flow experimental platform and found that the surfactant SDBS changes the tension of the gas–liquid interface, which promotes the formation of spiral annular flow and spiral dispersion flow at a lower gas–liquid velocity. Kanizawa et al 24 experimentally studied gas–liquid two-phase flow with a twisted tape, discussed the influence of different flow patterns on the pressure drop, and proposed a new method to predict the pressure drop of gas–liquid two-phase spiral flow with a twisted tape.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Flow Pattern of Spiral Annular Flow with a Guide Strip by Spiral On-Way

Rao

Wang²,

2022

ACS Omega

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To study the gas–liquid two-phase spiral annular flow pattern and its conversion law in a horizontal tube with twist tape by spiral on-way, a numerical simulation is carried out using the RNG k-ε model, and the DPM model is adopted as the particle motion model. The research results show that three main flow patterns are obtained, which are spiraling churn flow, spiraling annular flow, and spiraling annular twine flow. The ratio of the liquid-phase to gas-phase velocity V L / V G is the main factor that affects the existence of the gas phase. When V L / V G > 1/2, the flow pattern is a spiral cluster flow; when 1/5 < V L / V G < 1/2, the flow pattern is a spiral annular flow; and when V L / V G < 1/5, the flow pattern is a spiral annular flow. Compared with the flow pattern of the local spiral flow pattern of the short twisted band, it was found that the occurrence conditions of annular flow were postponed and a new flow pattern appeared. The research results of this paper have guiding significance for the pipeline risk management of natural gas hydrates and the engineering application of the full rotation of guide strips.

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Investigation on gas hydrate formation properties in a spiral flow using a flow loop

Cited by 7 publications

References 0 publications

Multiscale Turbulence Characteristics of Gas–Liquid Pressure Fluctuations in an Industrial Quatro Static Mixer

Multiscale Turbulence Characteristics of Gas–Liquid Pressure Fluctuations in an Industrial Quatro Static Mixer

Numerical Simulation Study on the Flow Field and Separation Efficiency by Built-In Twisted Tape in the Hydrocyclone

Numerical Simulation of the Flow Pattern of Spiral Annular Flow with a Guide Strip by Spiral On-Way

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