Effect of bubble size on bubble rising velocity and stagnation in a granular bed

Zhang, Yingchun; Wang, Wei; Xu, Xin; Yang, Qiang

doi:10.1016/j.ceja.2022.100425

Chemical Engineering Journal Advances

2022

DOI: 10.1016/j.ceja.2022.100425

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Effect of bubble size on bubble rising velocity and stagnation in a granular bed

Yingchun Zhang¹,

Wei Wang²,

Xin Xu³

et al.

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Cited by 4 publications

References 23 publications

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Research on the influence of aeration manners on the mass transfer characteristics of bubbles in multi‐column airlift photobioreactor

Fu,

Liu,

Zhou

et al. 2024

Asia-Pacific J Chem Eng

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Mass transfer of bubbles is important in microalgae cultivation. In this study, aiming to improve the microalgae culturing efficiency, computational fluid dynamics (CFD) was adopted to study the influence of the aeration manners on mass transfer of bubbles within ascending columns in multi‐column airlift photobioreactor (PBR) and the hydrodynamic conditions within the PBR under different aeration manners. In addition, the bubble generation time, the detachment diameter, and the average volumetric mass transfer coefficient of bubbles in ascending columns were analyzed. Furthermore, the experimental results were compared with the simulation results obtained from microalgae cultivation. The results showed that the whole aeration manner yields the lowest mixing strength and mass transfer efficiency of bubbles at an aeration rate of 0.2 vvm. Conversely, both the mixing strength of the liquid and mass transfer coefficient of bubbles were enhanced under the half and alternate aeration manners. However, the results demonstrated that the distribution of the flow field was not uniform under the half aeration manner and there were obvious high‐speed and low‐speed zones. In contrast, the flow field distribution in the PBR was more uniform under the alternate aeration manner, which was suitable for microalgae cultivation at high concentration. This study effectively enhanced the mixing strength and CO2 transfer rate in the PBR.

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Research on the influence of aeration manners on the mass transfer characteristics of bubbles in multi‐column airlift photobioreactor

Fu,

Liu,

Zhou

et al. 2024

Asia-Pacific J Chem Eng

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Entrainment probability of coal particle by bubble trailing vortex in coal flotation

Zhu

Pan

Zhang

et al. 2023

Fuel

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Gas–liquid upflow packed bed reactors: a comprehensive review focused on heat transport

Taulamet,

Martínez,

Barreto

et al. 2024

Reviews in Chemical Engineering

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A review of the available information about the packed bed reactors with cocurrent upflow of gas and liquid (UFRs), particularly focused on heat transfer with an external medium through the container wall, was undertaken in this contribution. The typical use of such reactors is summarized as well as some novel applications. A brief discussion about fluid-dynamics is also made due to its strong effect on the transport processes. Experimental setup, available data, and literature correlations of heat transfer parameters are thoroughly reviewed. From a critical analysis of the experimental data, a refined database has been built, which allows comparing the performance of the existing correlations for the two parameters of the extensively employed two-dimensional pseudo-homogeneous plug flow model (i.e., effective radial thermal conductivity and wall heat transfer coefficient). In addition, new correlations for these parameters have been developed, which allow improving the actual predictive capabilities. Finally, the global heat transfer between the bed and the wall was comparatively analyzed for upflow (UFRs) and downflow (TBRs) gas–liquid packed bed reactors.

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Effect of bubble size on bubble rising velocity and stagnation in a granular bed

Cited by 4 publications

References 23 publications

Research on the influence of aeration manners on the mass transfer characteristics of bubbles in multi‐column airlift photobioreactor

Research on the influence of aeration manners on the mass transfer characteristics of bubbles in multi‐column airlift photobioreactor

Entrainment probability of coal particle by bubble trailing vortex in coal flotation

Gas–liquid upflow packed bed reactors: a comprehensive review focused on heat transport

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