Slug Regime Transitions in a Two-Phase Flow in Horizontal Round Pipe. CFD Simulations

Сергеев, В. В.; Vatin, Nikolai; Kotov, E. V.; Nemova, Darya; Khorobrov, Svyatoslav

doi:10.3390/app10238739

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…The results show that the energy savings in summer of the double skin facade with PV panels is about 12.16% compared to the double skin facade with shading blinds and 25.57% without them [65][66][67].…”

Section: Discussionmentioning

confidence: 98%

Multi-Skin Adaptive Ventilated Facade: A Review

2022

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Multi-skin ventilated facades with integrated building elements that respond to climatic conditions (mechanized openings and automatic shading with intelligent control) present the potential of improving overall annual energy savings by adapting the thermal properties of buildings. This paper presents a literature review on multi-skin adaptive ventilated facades. Additionally, this article presents a literature review on building envelopes that contain inner-air layers. The operation modes of the air layer used in building enclosure structures are classified and summarized and the thermal performance and benefits of climate-adaptive facades are discussed and reviewed. The existing operation modes of the air layer used in building envelopes are summarized, outlined and roughly classified into the following types: the enclosed type, the naturally ventilated type and the mechanically ventilated type. One of the sustainable development trends is the investigation and application of energy-efficient climate-adaptive facades. In this study, the energy modeling of a high-rise office building was calculated using the Green Building Studio. The annual energy, the annual CO2 emissions, and life cycle energy for the following three types of facade were estimated: a single-layer facade made of three-layer glass with argon, a double ventilated facade, and a triple ventilated facade with a double chamber. The calculation results show that the annual energy of the building with an adaptive triple-skin facade could be reduced by 15% compared with buildings with a single skin facade.

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Section: Discussionmentioning

confidence: 98%

Multi-Skin Adaptive Ventilated Facade: A Review

2022

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“…In this model, a single set of momentum equations is shared by the gas-liquid two phases, and the tracking of the interface between the gas and liquid is accomplished by the solution of a continuity equation [31,32]. The continuity and momentum equations used in the VOF model are given below [33,34]:…”

Section: Volume Of Fluid Modelmentioning

confidence: 99%

Flow-Induced Vibration of a Reversed U-Shaped Jumper Conveying Oil-Gas Two-Phase Flow

Zhu

Tang

Li³

2023

Processes

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Subsea jumpers connecting the underwater wellhead and nearby manifold commonly undergo flow-induced vibration (FIV) due to the spatially frequent alteration in the flow direction, velocity, pressure and phase volume fraction of the oil–gas two-phase flow, potentially leading to fatigue damage. This paper reports the numerical results of the FIV of a reversed U-shaped jumper excited by gas–liquid two-phase flow, which evolves from the initial slug flow with a fixed gas–liquid ratio of 1:2 when transporting through the jumper. The FIV response and flow pattern evolution are examined with a gas flow rate of Qg = 4–12 kg/s and a liquid flow rate of QL = 96–288 kg/s. When the gas–liquid flow passes through the jumper, the flow regime subsequently presents the slug flow, bubble flow, churn flow and imperfect annular flow. The out-of-plane response frequency coincides with the pressure fluctuation frequency for the four connecting bends, suggesting the fluid–structure interaction (FSI). Nevertheless, the vibration displacement is limited with the maximum value less than 0.0014D (where D is the jumper diameter) in the present considered flow rate range.

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“…However, there are a number of drawbacks in this approach [19]. As an alternative to static flow regimes, the Inter-facial Area Transport Equation (IATE) was put out as an analytical tool that might better account for the dynamics of interfacial structure development [20].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Identifying the mechanism of the mixed-phase flow in the horizontal pipeline using computational fluid dynamic approach

Aned

Raheemah

Fadheel

2022

EEJET

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In this study, computational analysis has been carried out using computational fluid dynamics (CFD). These calculations have been made to investigate the rheological behavior of the mixed-phase flow in horizontal pipelines. In order to study the shear stress in a vertical pipe, a new numerical model for oil-water dispersion in three dimensions has been developed. CFD software has been used to study the wall shear stress function and water droplet pressure. Using Reynolds numbers and the Navier-Stokes equations with k–turbulence factor to save energy, the flow range for the continuous process was explained. The results from a recent study on experimental methodology were simulated. In this study, the diameter of the tube is 40 mm and the length is 3.5 m and modeled and analyzed using Ansys software. Thus, the geometry has been imported and modeled using the CFD tool. The meshed model has been tested and converged accordingly. The primary data of the simulation have been verified with experimental results successfully. Oil droplet widths have previously been thought to be dependent on the flow Reynolds number, which was confirmed in this case study. Droplet diameter Dd was measured at 6 mm while the mixture moved at a speed of 1.9 m/s. It was found that the largest shear stress value was found at the top of the pipe, where the oil fraction (cut-off) was 0.3, in the simulation results for varied velocities (1.6, 2.5, 2.9 m/s) and oil fraction (cut-off) values. The results of the simulation analysis of the two-phase flow of crude oil for the horizontal pipe are wall shear stresses with different velocities for crude oil in the two-phase flow. As well as pressure drop at different velocities for the same fluids

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Slug Regime Transitions in a Two-Phase Flow in Horizontal Round Pipe. CFD Simulations

Cited by 8 publications

References 32 publications

Multi-Skin Adaptive Ventilated Facade: A Review

Multi-Skin Adaptive Ventilated Facade: A Review

Flow-Induced Vibration of a Reversed U-Shaped Jumper Conveying Oil-Gas Two-Phase Flow

Identifying the mechanism of the mixed-phase flow in the horizontal pipeline using computational fluid dynamic approach

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