Interrogating the effect of an orifice on the upward two-phase gas–liquid flow behavior

Zeghloul, Ammar; Aberqi, Ahmed; Saidj, Faiza; Azzopardi, B.J.

doi:10.1016/j.ijmultiphaseflow.2015.04.013

Cited by 24 publications

(20 citation statements)

References 19 publications

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“…A schematic diagram of the experimental facility employed showing the locations of the orifice plates and nine conductance probes used for the void fraction measurements is shown in Figure 1. It is the same test facility as that used previously by Zeghloul et al 17 The main modification is the addition of the measurement devices for pressure drop and the associated pipes and fittings.…”

Section: Experimental Setup and The Methodologymentioning

confidence: 99%

“…The liquid (water) was then introduced into the chamber surrounding the gas injector, which in turn created more evenly circumferential mixing. For more details on mixer design, see Zeghloul et al 17 Downstream of the mixer, an air/water mixture flows first through the orifice in a vertical test section then through a vertical bend attached with a horizontal pipe and finally back down into the storage tank where both the water and the air are separated. The water, after separation, is recirculated while the air is always released to the atmosphere.…”

Section: Experimental Setup and The Methodologymentioning

confidence: 99%

“…at 121 pipe diameters). Details on the conductance probe technique; namely, the design of the probes, the associated electrical conditioning circuit and the calibration methodology are already presented in Zeghloul et al, 17 Zeghloul, 18 and Morsi et al 19 The pressure drop across the orifice is measured by using two FOXBORO differential pressure transmitters mounted in parallel. The ranges of these two differential pressure transmitters are (0-7.2 kPa) and (0-36 kPa) respectively, with an accuracy of 2% of the full scale of these transmitters.…”

Section: Experimental Setup and The Methodologymentioning

confidence: 99%

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Behavior and pressure drop of an upwardly two-phase flow through multi-hole orifices

Zeghloul

Aberqi

Hasan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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Experimental results on hydrodynamic behavior and pressure drop of two-phase mixture flowing upwardly in a pipe containing single- and/or multi-hole orifice plate are presented. It was found from the measurement of the void fraction upstream and downstream the orifices that the flow behavior is significantly affected by the layout of the orifice plate used and the flow starts to recover after approximately 7 D downstream the orifice. Furthermore, increasing orifice holes number results in decreasing the slip ratio. The standard deviation of the void fraction was used to identify the flow pattern before and after the orifices and found that the critical threshold transition occurred at a standard deviation of 0.2. The flow homogenization necessitates a minimum value of the liquid superficial velocity to occur, and the position where it takes place depends on this velocity and on the orifice holes number. It was also inferred from the two-phase pressure drop data across the orifices that three different flow regimes, where the transition between bubbly-to-slug and slug-to-churn flow, can be identified. An assessment of the predicted two-phase flow multiplier using some previous models dedicated to single-hole orifice was achieved; and found that the model proposed by Simpson et al. is the most reliable one. Single-phase pressure drop was also measured and compared with correlations from literature.

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Section: Experimental Setup and The Methodologymentioning

confidence: 99%

Section: Experimental Setup and The Methodologymentioning

confidence: 99%

Section: Experimental Setup and The Methodologymentioning

confidence: 99%

See 1 more Smart Citation

Behavior and pressure drop of an upwardly two-phase flow through multi-hole orifices

Zeghloul

Aberqi

Hasan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Also, they are used for metering purposes to measure flow rate of the two-phase flow or mass quality [1], [2]. They also can be used to relive excessive pressure as it is the case in rupture disc in nuclear and chemical reactors [3], [4]. Moreover, multiple orifice valves (MOV) are used in the oil and gas wellhead applications to control the pressure and flow of the multiphase flow from the well [5].…”

Section: Introductionmentioning

confidence: 99%

“…Zeghloul et al [3] performed experiments on two-phase flow through orifice in a vertical pipe with area ratio of 0.54 and 0.73. In this study, void fraction measurements were conducted in nine locations using conductance method for bubbly, slug and churn flow patterns observed upstream.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Pressure and Void Fraction Changes for Two-Phase Flow Through Flow-Restricting Orifices

Almalki

Ahmed

2019

Computational and Experimental Methods in Multiphase and Complex Flow X

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In this work, the change of pressure and void fraction of adiabatic air-water two-phase flow through orifices are experimentally investigated. Horizontal pipes with an internal diameter of 25.4 mm with multiple orifices with area ratios of 0.062, 0.14, 0.25 and 0.54 are considered. Both pressure and void fraction distributions upstream and downstream of the orifice are obtained for intermittent flow patterns and are compared with a straight pipe without the restriction for gas superficial velocity of 0.657 m/s and liquid superficial velocity of 0.523 m/s. The flow redistribution across the orifices is also recorded using a high-speed imaging camera at a frame rate of up to 3 kHz. The effect of the area ratio on the local pressure and void fraction upstream and downstream of the restriction is investigated. The results show that the fully developed void fraction upstream of the orifice increased with the increase in the pressure-drop across the orifice. Far from the orifice, the values of the average pressure gradient and the time average void fraction of the piping with orifices approached the fully developed values similar to the case of the straight pipe without restriction. The flow pattern changes across the orifice are found to significantly depend on the area ratio.

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Flow disturbances induced by an orifice plate in a horizontal air-water flow in the slug regime

Maidana

Rosa

2018

Experimental Thermal and Fluid Science

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Interrogating the effect of an orifice on the upward two-phase gas–liquid flow behavior

Cited by 24 publications

References 19 publications

Behavior and pressure drop of an upwardly two-phase flow through multi-hole orifices

Behavior and pressure drop of an upwardly two-phase flow through multi-hole orifices

Experimental Investigation of Pressure and Void Fraction Changes for Two-Phase Flow Through Flow-Restricting Orifices

Flow disturbances induced by an orifice plate in a horizontal air-water flow in the slug regime

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