Bubble size distribution in a bubble column with vertical tube internals: Experiments and <scp>CFD‐PBM</scp> simulations

Guan, Xiaoxu; Yang, Ning

doi:10.1002/aic.17755

Cited by 6 publications

(2 citation statements)

References 49 publications

(127 reference statements)

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“…Table lists the d 32 and ε G of the bubble column, airlift reactor, stirred tank, ,, rotating foam reactor, and SRPB. The dimensions of the reactors and energy dissipation rates (δ) were also listed.…”

Section: Resultsmentioning

confidence: 99%

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Local Gas Holdup, Bubble Size Distribution, and Bubble Velocity in a Submerged Rotating Packed Bed Reactor

Yang,

Xu,

et al. 2024

Ind. Eng. Chem. Res.

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Rotating packed bed (RPB) commonly generates tremendous centrifugal force to disperse the liquid phase and promote mass-transfer processes. However, plenty of chemical processes, such as oxidation and fluorination, featuring dispersed gas and continuous liquid, exist in the chemical industry. The gas-dispersed systems possessed low gas/liquid ratios, and the liquid residence time and operating mode of conventional RPBs cannot meet such reaction needs. Herein, a submerged RPB was developed for gas-dispersed systems. The stainless-steel wire mesh packing was immersed in liquid, while gas was dispersed and cocurrently flowed with liquid through the rotating packing. Hydrodynamic characteristics of the gas dispersion performance were then investigated by optical probe measurements. Results indicated that local gas holdup (0.85−5.42%) was proportionally correlated to the gas flow rate. Bubble size conformed to the log−normal distribution with a standard deviation in ranges of 0.59−1.17. With the elevation of rotational speed and diminishment of aeration rate, Sauter mean diameter of bubbles (d 32 , 1.49−5.51 mm) was decreased, and the average velocity of bubbles (v, 0.56−1.85 m/s) was increased. In a 0.05% ethanol−water solution, bubble coalescence probability could be reduced, and the bubble size was 20.2% smaller than that in water. Correlations to predict d 32 and v were established with deviations less than ±20 and ±15%, respectively.

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Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 10b, the deviations between predicted and experimental v are within ±15%. 47 airlift reactor, 48 stirred tank, 11,38,49 rotating foam reactor, 16 and SRPB. The dimensions of the reactors and energy dissipation rates (δ) were also listed.…”

Section: Bubble Velocitymentioning

confidence: 99%

Local Gas Holdup, Bubble Size Distribution, and Bubble Velocity in a Submerged Rotating Packed Bed Reactor

Yang,

Xu,

et al. 2024

Ind. Eng. Chem. Res.

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Numerical simulations of particle concentration and size effects in a slurry bubble column with a CFD‐PBM coupled model

Shen,

Zhang,

Jia

et al. 2024

AIChE Journal

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The combined effects of particle concentration (0–20 vol%) and particle size on the hydrodynamics of a slurry bubble column were studied by computational fluid dynamics coupled with population balance model (CFD‐PBM) in a wide range of superficial gas velocity (0.02–0.20 m/s). This CFD‐PBM coupled model included multiple effects of particles, namely increased slurry viscosity, reduced drag force, promoted bubble coalescence, and attenuated liquid turbulence, among which turbulence attenuation was crucial. To quantify liquid turbulence attenuation, a mechanistic model was established by equating the energy dissipated by particle motion to the attenuated liquid turbulence energy calculated from turbulent energy spectrum. The turbulent energy dissipation rate was reduced by over 60% at a solid concentration of 20%. Using this model, the effects of particle concentration and particle size on overall gas holdup were well predicted. This model advanced our understanding of how particles affect the gas holdup in a slurry bubble column.

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Dynamics of two bubbles colliding at high Reynolds numbers in water: Bubble rebound behavior study

Song,

Fang,

Xiang

et al. 2024

AIChE Journal

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The collision between bubbles is essential to gas–liquid dispersion systems. When bubbles encounter each other, they may either rebound or coalesce. Yet, little is known about the rebound dynamics immediately after two bubbles collide. This work investigates such collision dynamics of two bubbles at high Reynolds numbers in water through experiment and simulation. The moving velocity, deformation, contact time during collision and restitution coefficient of bubbles are analyzed. Simulations reproduced quantitatively the bubble rebound behavior, revealing the evolution of various energies involved in collision. Simulation results show that over 70% of the system's initial mechanical energy (SME) could be converted into bubble surface energy (BSE) during the approach. In turn, the excess BSE is converted back into SME driving bubbles to rebound with significant dissipation. A mass‐spring‐damper model is developed, which describes the dynamic of bubble rebound well. This contribution enhances the understanding of bubble interactions in multiphase flow.

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Bubble size distribution in a bubble column with vertical tube internals: Experiments and CFD‐PBM simulations

Cited by 6 publications

References 49 publications

Local Gas Holdup, Bubble Size Distribution, and Bubble Velocity in a Submerged Rotating Packed Bed Reactor

Local Gas Holdup, Bubble Size Distribution, and Bubble Velocity in a Submerged Rotating Packed Bed Reactor

Numerical simulations of particle concentration and size effects in a slurry bubble column with a CFD‐PBM coupled model

Dynamics of two bubbles colliding at high Reynolds numbers in water: Bubble rebound behavior study

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