Slug Flow

Grace, John R.

doi:10.1002/9783527699483.ch8

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…The power spectra are similar, but there is no more noise after 1 Hz at a height of approximately 1.7 m. Furthermore, the cross-correlation functions are smoothed while for wall slugs they are stepped shapes and allow the identification of upward slug velocities around 0.4 m/s. These values are in good agreement with the prediction of the two-phase theory of fluidization [33,39].…”

Section: Synthesissupporting

confidence: 89%

“…In the fast fluidization case, a phase inversion occurs, and the velocity measured by the cross-correlation is then relative to clusters of particles [20]. [33,39]. In this equation, a coefficient k of 0.35 or 0.7 applies for the axisymmetric or the wall slugging regime respectively.…”

Section: Cross-correlation Analysesmentioning

confidence: 99%

“…In the Figure, values are plotted versus the sum of the excess air velocity and the upward particles velocity, U p = G p /ρ p α i , for the various G p values. The dashed line in the Figure represents the upward slugs velocities calculated with the two-phase theory of fluidization for the case of axisymmetric slugs, where U s,th = U air − U m f + U p + k gD t (in a fluidization column)[33,39]. In this equation, a coefficient k of 0.35 or 0.7 applies for the axisymmetric or the wall slugging regime respectively.…”

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confidence: 99%

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Gas-Solid Flow in a Fluidized-Particle Tubular Solar Receiver: Off-Sun Experimental Flow Regimes Characterization

et al. 2021

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The fluidized particle-in-tube solar receiver concept is promoted as an attractive solution for heating particles at high temperature in the context of the next generation of solar power tower. Similar to most existing central solar receivers, the irradiated part of the system, the absorber, is composed of tubes in which circulate the fluidized particles. In this concept, the bottom tip of the tubes is immersed in a fluidized bed generated in a vessel named the dispenser. A secondary air injection, called aeration, is added at the bottom of the tube to stabilize the flow. Contrary to risers, the particle mass flow rate is controlled by a combination of the overpressure in the dispenser and the aeration air velocity in the tube. This is an originality of the system that justifies a specific study of the fluidization regimes in a wide range of operating parameters. Moreover, due to the high value of the aspect ratio, the particle flow structure varies along the tube. Experiments were conducted with Geldart Group A particles at ambient temperature with a 0.045 m internal diameter and 3 m long tube. Various temporal pressure signal processing methods, applied in the case of classical risers, are applied. Over a short acquisition time, a cross-reference of the results is necessary to identify and characterize the fluidization regimes. Bubbling, slugging, turbulent and fast fluidization regimes are encountered and the two operation modes, without and with particle circulation, are compared.

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Section: Synthesissupporting

confidence: 89%

Section: Cross-correlation Analysesmentioning

confidence: 99%

mentioning

confidence: 99%

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Gas-Solid Flow in a Fluidized-Particle Tubular Solar Receiver: Off-Sun Experimental Flow Regimes Characterization

et al. 2021

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An Experimental Investigation of Slugging Phenomenon in 2D Binary Gas–Solid Tapered Fluidized Beds

Sahoo,

Sarkar

2024

steel research int.

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Gas–solid fluidized beds are widely employed in metallurgical industries to produce direct reduced iron. For such practical applications, tapered fluidized beds are most suitable for handling particles with wide size distribution due to the axial velocity gradient. Herein, the slug behavior in binary tapered fluidized beds has been studied using a high‐speed camera and digital image analysis method. The influence of taper angle, air velocity, and fine fraction on local parameters such as slug size, rise velocity, and aspect ratio, and bulk parameters such as slug number and its area fraction, and bed expansion ratio has been investigated. The local parameters increase with taper angle, air velocity, and fine fraction. The slug area fraction and the bed expansion ratio increase with air velocity and fine fraction. The bed expansion ratio increases while the slug area fraction decreases with taper angle. The slug number fraction, slug area fraction, and bed expansion ratio range from 0.027–0.241, 0.20–0.63, and 1.11–1.42, as taper angle, air velocity, and binary composition vary from 0°–15°, 0.20–0.35 m s−1, and 0.25–0.75, respectively. An empirical correlation is proposed for bed expansion ratio prediction. Based on the present investigation, the optimum taper angle is 5°–10°.

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Investigation of equivalent spherical bubble diameter at high inlet velocity pool scrubbing conditions

Bicer,

Hong,

Cho

2024

Nuclear Engineering and Technology

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Slug Flow

Cited by 4 publications

References 15 publications

Gas-Solid Flow in a Fluidized-Particle Tubular Solar Receiver: Off-Sun Experimental Flow Regimes Characterization

Gas-Solid Flow in a Fluidized-Particle Tubular Solar Receiver: Off-Sun Experimental Flow Regimes Characterization

An Experimental Investigation of Slugging Phenomenon in 2D Binary Gas–Solid Tapered Fluidized Beds

Investigation of equivalent spherical bubble diameter at high inlet velocity pool scrubbing conditions

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