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

Maidana, Nathan da Costa; Rosa, Eugênio Spanó

doi:10.1016/j.expthermflusci.2018.01.028

Cited by 15 publications

(1 citation statement)

References 16 publications

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“…The results showed that translational slug velocity, as well as slug length, increased as the flow passed through the sudden contraction, while the dominant frequency of slug flow almost remained unchanged. Maidana and Rosa (2018) experimentally studied changes in slug flow characteristics when the flow passed through orifice plates. In this research, different area contractions of the orifice plates, as well as different orifice-to-mixer distances, were investigated in a 0.026 m diameter pipe.…”

Section: Introductionmentioning

confidence: 99%

Gradual contraction of pipe cross-section effects on transient behavior of air–water slug flow

et al. 2020

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The current experimental investigation was aimed at understanding the influence of reducing sections on the transient behavior of slug flow. Experiments were carried out using two concentric area cross-section reducers with 160 mm lengths; the first one was shaped as a conical frustum with a 44 mm inlet diameter reducing to a 30 mm outlet diameter and the second one as a frustum with the same inlet diameter converting to a rectangular crosssection (34 mm×21 mm). Four different water superficial velocities (0.43, 0.55, 0.72 & 0.84 m s −1 ) and three different air superficial velocities (2.5, 3.6 & 4.9 m s −1 ) were applied in the course of the experiments. Visualization studies, as well as frequency distribution analyses, were used to observe flow field changes. The visualization study showed that the gas slug tail, liquid slug, and gas slug subsequent to passing through the reducers converted to nonhomogeneous bubbly flow, several small slugs, and pseudo-slugs, respectively. The obtained frequency distributions, which were calculated using a Fourier transform tool, showed that unlike that of the dominant frequency, the power of other frequencies was amplified in the low-frequency range owing to the high formation rate of pseudo-slugs and small slugs. This change indicates that intermittent air-water slug flow with a specified dominant frequency subsequent to passing reducers varies to an uncertain flow with semi-uniform distribution in the low-frequency range. Estimation of Shannon entropy also showed that entropy increased by almost five times downstream of the reducers, which confirms that energy is distributed uniformly in a broad frequency bandwidth. Analyses of the essential bandwidth showed that the reducing section acted as a frequency distribution modifier whose performance | The Japan Society of Fluid Mechanics Fluid Dynamics Research Fluid Dyn. Res. 52 (2020) 025502 (16pp)

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Section: Introductionmentioning

confidence: 99%

Gradual contraction of pipe cross-section effects on transient behavior of air–water slug flow

et al. 2020

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Flow characteristics of blade unit of a tridimensional rotational flow sieve tray under concurrent gas–liquid flow

et al. 2020

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The flow characteristics of the blade unit of a tridimensional rotational flow sieve tray were investigated. First, the flow patterns are defined under different liquid arrangement methods. They are bilateral film flow, continuous perforated flow, and dispersion‐mixing flow in overflow distribution, film and jet flow and jet and mixed flow in spray distribution. Second, the time and frequency domain analysis of the differential pressure pulsation signal in the blade unit is carried out, the main frequencies range is 2.0−5.5 Hz. The influence of perforation and mixing intensity on the flow pattern transition is clarified. Third, the rotational flow ratio of the gas–liquid phase is measured, the gas phase rotational flow range is 0.55–0.78, and the liquid phase range is 0.15–0.42. The influence of the operating conditions on the distribution of the rotational and perforated flow is investigated. Finally, a prediction model for the rotational flow ratio is proposed.

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Influence of a sudden expansion on slug flow characteristics in a horizontal two-phase flow: a pressure drop fluctuations analysis

et al. 2018

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

Cited by 15 publications

References 16 publications

Gradual contraction of pipe cross-section effects on transient behavior of air–water slug flow

Gradual contraction of pipe cross-section effects on transient behavior of air–water slug flow

Flow characteristics of blade unit of a tridimensional rotational flow sieve tray under concurrent gas–liquid flow

Influence of a sudden expansion on slug flow characteristics in a horizontal two-phase flow: a pressure drop fluctuations analysis

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