Measurement of Local Phase Holdups in a Two- and Three-Phase Bubble Column

Dziallas, H.; Michele, Volker; Hempel, D. C.

doi:10.1002/1521-4125(200010)23:10<877::aid-ceat877>3.3.co;2-6

Cited by 2 publications

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“…Some researchers tried to study the effect of the particles on the gas holdup, but the study numbers remained low [29]. Dziallas et al [30] measured the local phase holdups with an invasive sensing probe in a three-phase bubble column. It was found that the solid phase caused a decrease of the local gas holdup.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the effect of the solid loading was different for the continuous and batch operations and the gas holdup was influenced by the net effect produced by all the parameters. Measurement studies of the local gas holdups in the threephase systems are rare [30]. Mokhtari and Chaouki [29] summarized the methods for measuring the local solid concentrations in the slurry bubble column and they developed a new measurement technique by using optical fiber probes to determine the local solid concentrations and gas holdup simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

Zhou²,

Sun

et al. 2021

Chem Eng & Technol

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The impacts of the solid volume fraction V s and particle size d p on the total and local gas holdups in gas-liquid-solid bubble columns under different flow regimes were investigated. The flow regimes discussed were the discrete bubble regime (DBR), transition regime (TR), bubble coalescence regime (BCR), and strong turbulent regime (STR). The results demonstrated that the bed average gas holdup e g decreased with higher solid volume fraction in DBR, TR, and BCR. The increment of the solid volume fraction promoted bubble coalescence and also can enhance the particle effect on the average gas holdup. The e g changed slightly when shifting the V s or d p in STR. A new correlation for e g was developed considering the particle properties and the flow regimes studied.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

Zhou²,

Sun

et al. 2021

Chem Eng & Technol

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Euler/Lagrange Calculations of Gas-Liquid-Solid-Flows in Bubble Columns with Phase Interaction

Bourloutski

Sommerfeld

2004

Bubbly Flows

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Abstract. This paper presents a mathematical model based on EulerlLagrange approach for time-dependent calculations of two-(gas-liquid) and three-(gasliquid-solid) phase flows in a bubble column. The fluid phase flow was calculated based on the Euler approach by solving the three-dimensional Reynolds-averaged conservation equations in a time dependent way. The set of equations was closed using the standard k-e turbulence model. Two-way coupling was accounted for by adding dispersed phase source terms in all conservation equations of the continuous phase and additionally considering wake-induced turbulence. Bubble motion was calculated by solving the equation of motion taking into account drag force, pressure, added mass force, transverse lift force, buoyancy and gravity. The tracking of solid particles was based on considering drag force, pressure, added mass force, Saffman force, Magnus force and gravity. The introduction of the effective density in the continuous phase conservation equations permitted to perform the calculations up to relatively high volume fractions of the dispersed phase. The interaction between bubbles and particles was considered by adding simple correction terms to the drag coefficient of both bubbles and particles. Alternatively, the interaction was described by collisions between bubbles and particles using a stochastic collision model. The comparison of the predicted results with experimental data from the literature showed reasonable good agreement for the cases of two-phase and three-phase flows.

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Measurement of Local Phase Holdups in a Two- and Three-Phase Bubble Column

Cited by 2 publications

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Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

Euler/Lagrange Calculations of Gas-Liquid-Solid-Flows in Bubble Columns with Phase Interaction

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