Review of measurement techniques for void fraction of two-phase flow through annulus

Ghendour, Nabil; Meribout, Mahmoud; Aberqi, Ahmed

doi:10.1016/j.measurement.2020.108196

Cited by 17 publications

(7 citation statements)

References 44 publications

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“…Furthermore, the high velocity of the liquid associated with this flow pattern makes the movement of the bubbles straight upward. The cap bubble flow, exhibits a relatively larger bubbles, about 3–5 mm diameter or occasionally larger, 1 the upward movement of the smaller bubbles follows a zigzag trajectory while the larger ones follow a straight course.…”

Section: Annulus Geometrical Parametersmentioning

confidence: 99%

“…However, experimental data on two-phase pressure drop in annuli are still lacking. Ghendour et al 1 reviewed in details the mostly used technique for void fraction measurements in annulus. In another work, Ghendour et al 2 performed an extensive numerical simulations using COMSOL Multiphysics software in order to model and design of a novel multi-electrodes conductance probe to achieve the optimum accuracy of void fraction measurement in an annulus.…”

Section: Introductionmentioning

confidence: 99%

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Two-phase flow in a vertical concentric annulus: Pressure drop and flow configuration

Zeghloul

Al–Sarkhi

Ghendour

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents experimental investigation of flow configurations and pressure drop of single-phase water flow and two-phase air-water flow in a vertical annulus. The annular test section had a concentric geometry with a casing and tubing diameter of 50 and 33.7 mm, respectively. The superficial velocity conditions of the liquid and gas were ranged 0.08–1.56 and 0–3.56 m/s, respectively. The combination of these superficial velocities produces the bubbly, slug and churn flow regimes. The identification of the flow patterns shows that the Mishima and Ishii model is the most relevant to highlight the flow transition. The measured friction factors were compared to prediction models from the literature. It was deduced that the model proposed by Gunn and Darling underestimates the liquid friction factor in the annulus. The measured pressure drops and the dimensionless pressure gradient evolution exhibits different slopes that characterize each flow pattern. The standard deviation and structure frequency describe specific ranges for each flow pattern. These two parameters can also be used for the prediction of flow patterns.

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Section: Annulus Geometrical Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-phase flow in a vertical concentric annulus: Pressure drop and flow configuration

Zeghloul

Al–Sarkhi

Ghendour

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

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“…Due to its importance, its accurate measurement has been the subject of numerous studies in the literature for decades. The void is mostly obtained by mean of the quick-valve method in the experimental test campaigns [2] which is a non-continuous method. However, most experimental techniques for its determination are either cumbersome, intrusive, or depending on an important calibration.…”

Section: Extended Abstractmentioning

confidence: 99%

“…However, most experimental techniques for its determination are either cumbersome, intrusive, or depending on an important calibration. Various reviews exist about all the measurement techniques available to determine it [2,4,5]. Thereby, numerous authors have tried over the last decades to develop correlations to predict the void fraction.…”

Section: Extended Abstractmentioning

confidence: 99%

Void Fraction Experimental Determination in Gas/Liquid Horizontal Pipe Flow by Mean of a Dual Optical Probe

Lecardonnel¹,

Servi²,

Colonna³

et al. 2022

World Congress on Momentum, Heat and Mass Transfer

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“…All this justifies the importance that can be assumed by monitoring the correct conditions of heat exchange in two-phase flow, to intervene promptly in case of deviation from the design parameters. In technical practice, various techniques have been developed [1], based on different physical phenomena, which allow the non-invasive monitoring of the pipes involved. Some of these techniques are based on the attenuation of gamma rays as a function of the vacuum degree of the liquid vapor mixture [2,3].…”

Section: Introductionmentioning

confidence: 99%

Recognition of two-phase flow pattern inside evaporator tubes

et al. 2021

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The convective heat exchange mechanism in two-phase regime, can allow high exchange coefficients, as long as particular conditions are respected, in terms of vapor quality. In evaporator tubes this problem is particularly important as a deviation from the optimal flow conditions can drastically drop the efficiency of the heat exchange. This work describes an innovative methodology for identifying the different two-phase flow regimes in evaporator pipes, through the processing of the vibrational data acquired on the pipe itself. An experimental apparatus with transparent pipes has been built up to recognize flow patterns by a fast image acquisition camera. Images have been associated to vibration data acquired on pipes by accelerometer. The analysis of frequency spectrum, led to first interesting results thus it is possible to distinguish between “no bubbles” regimes and different “bubbles” regimes. A wide test campaign has been realized on vertical and horizontal pipes, simulating steam bubbles with nitrogen bubbles, reproducing the main flow patterns. The paper demonstrates the possibility to design smart and non-intrusive sensor to be applied on evaporated tubes for the recognizing of anomalous thermal flow condition and sets the stage for future engineering work.

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Review of measurement techniques for void fraction of two-phase flow through annulus

Cited by 17 publications

References 44 publications

Two-phase flow in a vertical concentric annulus: Pressure drop and flow configuration

Two-phase flow in a vertical concentric annulus: Pressure drop and flow configuration

Void Fraction Experimental Determination in Gas/Liquid Horizontal Pipe Flow by Mean of a Dual Optical Probe

Recognition of two-phase flow pattern inside evaporator tubes

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