Interfacial Profiles and Flow Characteristics in Vertical Downward Two-Phase Plug and Foam Flows

Sekoguchi, Kotohiko; Mori, Koji; Kaji, Masahiro; Nakazatomi, Masao; Shimizu, Hideo

doi:10.1080/00986449608936427

Cited by 13 publications

(2 citation statements)

References 5 publications

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“…This probe array helps to investigate the K-H wave phenomenon in inclined, bubbly oil-water pipe flows and can be used to validate mathematical models of such flows. Individual conductance probes have widely been used in the past for characterizing multiphase flows [7][8][9], but the use of arrays of such probes is relatively new and is not widely reported in the literature, although in [10] a probe array for measuring the gas volume fraction in air-water flows is described.…”

Section: Introductionmentioning

confidence: 99%

Use of a novel dual-sensor probe array and electrical resistance tomography for characterization of the mean and time-dependent properties of inclined, bubbly oil-in-water pipe flows

Zhao

Lucas

2011

Meas. Sci. Technol.

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An array of dual-sensor conductance probes, which contains a number of dual-sensor probes equispaced across the diameter of an 80 mm pipe, is introduced in this paper for characterizing bubbly oil-in-water pipe flows inclined at angles from 15° to 60° to the vertical. Each dual-sensor probe measures the local axial oil velocity and the local oil volume fraction at the position of the probe. Choosing an averaging interval of 0.05 s, values of the local oil volume fraction and the local oil velocity were measured simultaneously at the different probe positions, enabling the time-dependent structure of the two-phase flow to be investigated. After data processing, time-dependent variations of volume fraction along the pipe were found which are consistent with the presence of intermittent Kelvin–Helmholtz wave structures in the flow. A high-speed dual-plane ERT system was used to measure the axial propagation speed of these Kelvin–Helmholtz waves, using cross correlation. This paper presents results for the measured characteristics of inclined oil-in-water flows including (i) time-averaged and time-dependent oil volume fraction and velocity distributions and (ii) the Kelvin–Helmholtz wave properties including the wave speed, wave amplitude, wavelength and wave frequency.

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Section: Introductionmentioning

confidence: 99%

Use of a novel dual-sensor probe array and electrical resistance tomography for characterization of the mean and time-dependent properties of inclined, bubbly oil-in-water pipe flows

Zhao

Lucas

2011

Meas. Sci. Technol.

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“…The first problem was the difficulty of accurately discriminating between the liquid slugs and large waves. In a previous study, one of the present authors measured the cross-sectional gas-liquid distribution in a tube using semi-supermultiple point-electrode probes (SS-PEP) [8], consisting of 67 point-electrodes distributed across the tube. The measurements revealed that huge waves [9] appeared from slug flow with increasing gas velocity, and that liquid slugs and huge waves coexisted in certain ranges of gas and liquid velocities.…”

Section: Introductionmentioning

confidence: 99%

Structure and void fraction in a liquid slug for gas–liquid two‐phase slug flow

Mori

Miwa

2002

Heat Trans. Asian Res.

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The distribution of gas and liquid in a gas-liquid two-phase slug flow was measured using semi-supermultiple point-electrode probes. Based on the measurements, the wake zone behind a gas slug and the low void-fraction zone in a liquid slug were defined, and the void fractions of the two zones were determined. The data revealed that the void fraction of the wake zone increased with superficial gas velocity, yet was virtually independent of superficial liquid velocity. Nondimensional head was proposed as an informative characteristic of this system, accounting for the momentum change of the liquid in the wake zone. It was clarified that the nondimensional head was closely related to the void fraction of the wake zone. A good practical relationship was found between the nondimensional head and the lengths of a swelling liquid-front zone and the wake zone. Furthermore, empirical correlations were proposed for the void fraction in the wake zone, the mean void fraction in the liquid slug, and the lengths of the swelling liquid-front zone and the wake zone.

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The measurement of local flow parameters for gas–liquid two-phase bubbly flows using a dual-sensor probe array

Zhai

Bian

Gao

et al. 2016

Chemical Engineering Science

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Interfacial Profiles and Flow Characteristics in Vertical Downward Two-Phase Plug and Foam Flows

Cited by 13 publications

References 5 publications

Use of a novel dual-sensor probe array and electrical resistance tomography for characterization of the mean and time-dependent properties of inclined, bubbly oil-in-water pipe flows

Use of a novel dual-sensor probe array and electrical resistance tomography for characterization of the mean and time-dependent properties of inclined, bubbly oil-in-water pipe flows

Structure and void fraction in a liquid slug for gas–liquid two‐phase slug flow

The measurement of local flow parameters for gas–liquid two-phase bubbly flows using a dual-sensor probe array

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