A Discussion on the Relation Between the Intermittent Flow Sub-Regimes and the Frictional Pressure Drop

Arabi, Abderraouf; Salhi, Yacine; Zenati, Youcef; Si‐Ahmed, El‐Khider; Legrand, Jack

doi:10.1016/j.ijheatmasstransfer.2021.121895

Cited by 18 publications

(13 citation statements)

References 61 publications

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“…10.a (framed in red). Indeed, the strong aeration of the liquid lm, highlighted in our previous study (Arabi et al, 2021c), causes that the bubbles present in this structure are also entrained inside the liquid slugs. In addition to their aeration, the liquid lm/elongated bubble interface presents undulations, which implies that the ow is air-driven type, according to França and Lahey (1992).…”

Section: Highly Aerated Slug Flowmentioning

confidence: 62%

“…They proposed to classify these ow regimes into three dominant ow sub-regimes which are plug Flow, Less Aerated Slug (LAS) and Highly Aerated Slug (HAS) ows. Using this approach, some scholars reported that knowing the nature of the ow sub-regimes would help to better correlating the slug frequency (Arabi et al, 2020) and the frictional pressure drop (Arabi et al, 2021c). The interaction of the intermittent ow with the pipes (one of the major challenges of the intermittent ow as explained in the recent review paper about slug ow presented by Mohmmed et al (2021) can be better understood by considering the sub-regimes (Arabi et al, 2021d)).…”

Section: (2022)mentioning

confidence: 99%

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Analysis of Horizontal Gas-liquid Intermittent Flow Sub-Regimes Transitions: Physical Mechanisms and Flow Maps

Arabi,

salhi,

Zenati

et al. 2023

Preprint

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These recent years, several experimental investigations were carried out on horizontal gas-liquid two-phase flow by considering the sub-regimes which are plug, Less Aerated Slug (LAS) and Highly Aerated Slug (HAS) flows. These sub-regimes classification is based on the shape of the elongated bubble/liquid slug interface as well as the aeration within liquid slugs. In this work, an extensive experimental visualization was performed using air-water mixture in a 30 mm ID horizontal pipe. The study has covered a total of 189 operating conditions. It was reported, for the first time, that each sub-regime had a specific mechanism for aeration of the liquid slug flow. the presence of gas bubbles within liquid slugs, in the case of plug flow, is due to the interfacial shear induced waves mechanism. The transitions to LAS and HAS flows are accompanied by the appearance of the shearing-off and scooping of the bubbles present in the liquid film into liquid slug mechanisms, respectively. In addition, the reported flow transition lines, as well those existing in the literature, were analyzed using different existing coordinate systems. This analysis allowed finding that the X-T system is the most suitable one for predicting the three flow sub-regimes.

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Section: Highly Aerated Slug Flowmentioning

confidence: 62%

Section: (2022)mentioning

confidence: 99%

Analysis of Horizontal Gas-liquid Intermittent Flow Sub-Regimes Transitions: Physical Mechanisms and Flow Maps

Arabi,

salhi,

Zenati

et al. 2023

Preprint

Self Cite

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show abstract

“…The originality of this work resides also in the use of feature space using the parameters obtained from calculated statistical moments and PDF. This paper is a continuation of our works on plug, LAS and HAS ow sub-regimes observed in a 30 mm ID pipe (Arabi, 2019;Arabi et al, 2020bArabi et al, , 2021bArabi et al, , 2021c).…”

Section: Introductionmentioning

confidence: 65%

“…Our group has obtained interesting results using this classi cation approach in series of recent works. Indeed, it was found that the slug frequency (Arabi et al, 2020), the pressure drop (Arabi et al, 2021c) and the behaviour of the ow structures crossing a sudden expansion (Arabi et al, 2021d), depend on the nature of the sub-regime. Despite these results, the investigations carried out using these sub-regimes classi cation are still scarce, as indicated by the limited number of existing ow pattern maps, showing the zones of the existence of these sub-regimes (Thaker and Banerjee, 2016;Dinaryanto et al, 2018;Humami et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Identifying the intermittent flow sub-regimes using pressure drop time series fluctuations

Arabi

Salhi

Zenati

et al. 2023

Preprint

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From a literature survey, it has been noticed a lack of objective methods to identify and distinct between the intermittent flow sub-regimes. Thus, the aim of this study is to analyze pressure drop fluctuations using statistical methods in order to propose simple tools to characterize the sub-regimes of the intermittent flow. The pressure drop time series were collected from experiments carried out using air-water mixture and 30 mm ID pipe. The utilization of transparent pipes allowed to identify three sub-regimes which are Plug flow, Less Aerated Slug flow (LAS flow), and Highly Aerated Slug flow (HAS flow). It was found that the PDF displayed a unimodal distribution in all cases studied. Meanwhile, the representation of the base width and maximum values of PDF as function of the gas-to-liquid superficial velocities ratio and the mixture Froude number, respectively, showed that the points for each sub-regime are clustered in the same zone. So, these two feature spaces can be used to identify the sub-regimes. A third feature space, based on the statistical parameters standard deviation and kurtosis, was also proposed as a tool to distinguish between the three sub-regimes.

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“…The separated flow approach remains relatively reliable especially considering its popularity for pressure drop modeling. The latter is notably used for the estimation of frictional pressure drop in the straight pipes (Muzychka and Awad, 2010;Sassi et al, 2020, Arabi et al, 2021a, as well as for the estimation of the pressure drop generated by the presence of different kinds of singularity, such as the bend (Azzi et al, 2000;Azzi and Friedel, 2005;Hayashi et al, 2020), the orifice (Zeghloul et al, 2017), the multi-hole orifice (Zeghloul et al, 2018), the gate and ball valves (Zeghloul et al, 2020), the pump valve (Ma et al, 2020), the Venturi (Messilem et al, 2020) or the static mixer (Hosni et al, 2023). The liquid pressure recovery of the model of Chisholm and Sutherland (1969) is calculated using the Borda-Carnot formula based on the momentum equation.…”

Section: Analysis Of Existing Modelsmentioning

confidence: 99%

Pressure recovery model for gas-liquid two-phase flow across sudden expansions

Arabi

Abdul-Majeed

Boukrouche

et al. 2023

Preprint

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The presence of a sudden expansion generates a variation of the static pressure commonly called Pressure Recovery (PR). In this paper, we made firstly an extensive literature survey to list existing gas-liquid two-phase flow pressure recovery models and to collect an experimental database. Thus, a total of 305 data was collected from 6 recent works and 18 predictive models was identified. An analysis of the different existing models was carried out firstly. Then, the predictive capability of nine existing models was assessed using the collected database. It was reported that none of the models can predict the experimental results for a large range of experimental conditions. This finding highlighted the necessity to propose a new model. The proposed predictive model was developed using the two-phase multiplier and mass quality. These two parameters were correlated using 157 data points from the collected database, while the other data was used to validate it. It was found that the proposed model gives better predictions compared to existing ones in the range of conditions and parameters of the experimental database used in this analysis.

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A Discussion on the Relation Between the Intermittent Flow Sub-Regimes and the Frictional Pressure Drop

Cited by 18 publications

References 61 publications

Analysis of Horizontal Gas-liquid Intermittent Flow Sub-Regimes Transitions: Physical Mechanisms and Flow Maps

Analysis of Horizontal Gas-liquid Intermittent Flow Sub-Regimes Transitions: Physical Mechanisms and Flow Maps

Identifying the intermittent flow sub-regimes using pressure drop time series fluctuations

Pressure recovery model for gas-liquid two-phase flow across sudden expansions

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