Radial Profiles of Gas Bubble Behavior in a Gas‐Liquid Bubble Column Reactor under Elevated Pressures

Jin, Haibo; Qin, Yujian; Yang, Suohe; He, Guangping; Guo, Zhi

doi:10.1002/ceat.201200551

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…Figure 10a is the measurement result when the sintered plate is used as the gas distributor and Figure 10b is the measurement result when the foam gun is used as the distributor. With the increase in the superficial gas velocity, the radial gas holdup increases, and the gas holdup gradually decreases from the center of the bubble column to the wall, which is consistent with most experimental results [20,26]. At the same time, under the same superficial gas velocity, the radial gas holdup of the foam gun distributor is higher than that of the sintered plate.…”

Section: Radial Gas Holdupsupporting

confidence: 88%

Effects of the Microbubble Generation Mode on Hydrodynamic Parameters in Gas–Liquid Bubble Columns

Ning

Jin

et al. 2020

Processes

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The hydrodynamics parameters of microbubbles in a bubble column were studied in an air–water system with a range of superficial gas velocity from 0.013 to 0.100 m/s using a differential pressure transmitter, double probe optical fiber probe, and electrical resistance tomography (ERT) technique. Two kinds of microbubble generators (foam gun, sintered plate) were used to generate microbubbles in the bubble column with a diameter of 90 mm, and to compare the effects of different foaming methods on the hydrodynamics parameters in the bubble column. The hydrodynamic behavior of the homogeneous regime and the transition regime was also studied. The results show that, by changing the microbubble-generating device, the hydrodynamic parameters in the column are changed, and both microbubble-generating devices can obtain a higher gas holdup and a narrower chord length distribution. When the foam gun is used as the gas distributor, a higher gas holdup and a narrower average bubble chord length can be obtained than when the sintered plate is used as the gas distributor. In addition, under different operating conditions, the relative frequency distribution of the chord length at different radial positions is mainly concentrated in the interval of 0–5 mm, and it is the highest in the center of the column.

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Section: Radial Gas Holdupsupporting

confidence: 88%

Effects of the Microbubble Generation Mode on Hydrodynamic Parameters in Gas–Liquid Bubble Columns

Ning

Jin

et al. 2020

Processes

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“…Most of the previous works focus on either a single bubble 3, 4 or a bubble swarm 5 in Newtonian fluids, while the literature on this topic in non‐Newtonian fluids remains in a quite elementary stage. Earlier investigations mainly focused on experimental visualization of the bubble volume 6.…”

Section: Introductionmentioning

confidence: 99%

Bubble Volume and Aspect Ratio Generated in Non‐Newtonian Fluids

Fan¹,

Sun²,

Chen³

2014

Chem Eng & Technol

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Bubble formation from an orifice submerged in quiescent polyacrylamide aqueous solution was investigated numerically with a sharp-interface coupled level-set/volume-of-fluid method based on the rheological characteristics of the fluid. In both non-Newtonian fluids and Newtonian fluids, the numerical approach was able to capture accurately the deformation of the bubble surface, validated by comparison with experimental results. The effects of orifice diameter, solution mass concentration, and gas flow rate on bubble volume and aspect ratio were evaluated. Both the instantaneous and detached volume decrease with the orifice diameter but increase with mass concentration and gas flow rate. The aspect ratio at the departing point tends to rise with the orifice diameter and mass concentration and falls with the gas flow rate.

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“…A wide variety of bioreactor configurations have been experimentally evaluated to enhance gas-liquid mass transfer characteristics including packed-bed reactors [7], monolithic biofilm reactors [8], trickle-bed reactors [9,10], stirred-tank reactors [11] and membrane-based reactors [12]. Industrial development efforts are largely focused on bubble-column reactors due to their longer gas-liquid contact times, favorable gas composition spatial profiles, and superior mass transfer properties [13,14]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Matrix Control of a Bubble‐Column Reactor for Microbial Synthesis Gas Fermentation

Liang

Henson³

et al. 2017

Chem Eng & Technol

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A spatiotemporal metabolic model of a representative syngas bubble-column reactor was applied to design and evaluate dynamic matrix control (DMC) schemes for regulation of the desired by-product ethanol and the undesired by-product acetate. This model was used to develop linear step response models for controller design and also served as the process in closed-loop simulations. A 2 2 DMC scheme with manipulation of the liquid and gas feed flows to the column provided a superior performance to proportional integral (PI) control due to slow process dynamics combining the multivariable and constrained nature of the control problem. Ethanol concentration control for large disturbances was further improved by adding the flow of a pure hydrogen stream as a third manipulated variable. The advantages of DMC for syngas bubble-column reactor control are demonstrated and a design strategy for future industrial applications is provided.

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Radial Profiles of Gas Bubble Behavior in a Gas‐Liquid Bubble Column Reactor under Elevated Pressures

Cited by 10 publications

References 26 publications

Effects of the Microbubble Generation Mode on Hydrodynamic Parameters in Gas–Liquid Bubble Columns

Effects of the Microbubble Generation Mode on Hydrodynamic Parameters in Gas–Liquid Bubble Columns

Bubble Volume and Aspect Ratio Generated in Non‐Newtonian Fluids

Dynamic Matrix Control of a Bubble‐Column Reactor for Microbial Synthesis Gas Fermentation

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