Dynamics of droplets and mass transfer in a rotating packed bed

Yan, Zijun; Cheng, Lin; Qi, Ruan

doi:10.1002/aic.14449

Cited by 29 publications

(16 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Flow in the packing region is complicated. As described by Yan et al (2014), although the Reynolds number based on the size of the pore/wire is usually low, part of the laminar liquid film flow near the packing surfaces develops into turbulence flow; therefore, partially turbulent flow could exist in the packing region. The SST k-model that was presented by Menter (1994) incorporates modifications for low-Reynolds number effects and it presents a good ability for describing the detailed flow in the RPB (Xie et al, 2017b).…”

Section: Governing Equationsmentioning

confidence: 99%

“…In the operation of the RPB, a solvent is radially injected into the packing region from the liquid distributor located at the centre of the bed, and gas can be fed into the bed from the periphery, or the centre of the bed to form a counter-current or co-current gas-liquid configuration, respectively. The rotating porous packing turns the continuous liquid into thin films and tiny droplets through the action of the shear, which significantly increases the interfacial area and consequently promotes the mass transfer between the liquid phase and the gas phase that flows through the RPB (Yan et al, 2014). In addition, there are other advantages of the RPB, such as the small footprint, the short-time response to meet the control requirements, the ability to deal with fluids with high viscosity (Wang et al, 2015).…”

Section: Introduction Of the Rpb And Its Investigationmentioning

confidence: 99%

See 1 more Smart Citation

A mesoscale 3D CFD analysis of the liquid flow in a rotating packed bed

Xie

Ding

et al. 2019

Chemical Engineering Science

View full text Add to dashboard Cite

Rotating packed beds (RPBs), as a type of process intensification technology, are promising to be employed as high-efficiency CO 2 absorbers. However, the detailed understanding of the liquid flow in the RPB is still very limited. The complex and dense packing of the bed and the multiscale of the RPB make it very difficult to perform numerical simulations in detail, in particular for full 3D simulations. In this paper, a mesoscale 3D CFD modelling approach is proposed which can be used to investigate the liquid flow in both laboratory-and large-scale RPBs in detail and accuracy. A 3D representative elementary unit of the RPB has been built and validated with experimental observations, and then it is employed to investigate the gas-liquid flows at different locations, across a typical RPB, so that the overall characteristics of the liquid flow in the RPB can be assembled. The proposed approach enables the detailed prediction of the liquid holdup, droplets formation, effective interfacial area, wetted packing area and specific surface area of the liquid within real 3D packing structures throughout the bed. New correlations to predict the liquid holdup, effective interfacial area, and specific surface area of the liquid are proposed, and the sensitivities of these quantities to the rotational speed, liquid flow rate, viscosity and contact angle have been investigated. The results have been compared with experimental data, previous correlations and theoretical values and it shows that the new correlations have a good accuracy in predicting these critical quantities. Further, recommendations for scale-up and operation of an RPB for CO 2 capture are provided. This proposed model leads to a much better understanding of the liquid flow behaviours and can assist in the RPB optimisation design and scaling up.

show abstract

Section: Governing Equationsmentioning

confidence: 99%

Section: Introduction Of the Rpb And Its Investigationmentioning

confidence: 99%

A mesoscale 3D CFD analysis of the liquid flow in a rotating packed bed

Xie

Ding

et al. 2019

Chemical Engineering Science

View full text Add to dashboard Cite

show abstract

“…Under high‐gravity, molecule diffusions are much faster than under normal gravity due to the injected liquid flow can be split continuously into discrete liquid ligaments, thin films, and tiny droplets by the rotating porous packing. [ 22–24 ] Therefore, the mixing and mass‐transfer processes can be intensified and the chemical reaction time and energy consumption can be dramatically decreased via utilizing the RPB.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Fe and Co supported on the N‐doped mesoporous carbon frameworks with enhanced oxygen reduction reaction performance via high‐gravity technology

Shi

Dong

et al. 2021

J Chinese Chemical Soc

View full text Add to dashboard Cite

The exploitation of high‐efficiency, inexpensive, as well as durable electrocatalysts for the oxygen reduction reaction (ORR) is of vital importance for the commercialization of fuel cells. In this study, we prepared an efficient non‐precious ORR electrocatalyst via high‐gravity technology. The results of physical characterization revealed that the Fe atoms could be uniformly dispersed on the Fe/Co/N‐MCF catalyst via the high‐gravity technology. The X‐ray photoelectron spectroscopy demonstrated that the Fe can be combined with N from the ZIF‐67 to form the Fe‐Nx structures, which has already been confirmed to be acted as validly ORR active sites. The electrochemical testing results showed that the Fe/Co/N‐MCF catalyst obtained via high gravity technology expressed a 24 mV positive than commercial Pt/C in terms of half‐wave potential. Moreover, Fe/Co/N‐MCF catalyst exhibited an excellent anti‐ethanol activity and durability, its current density only decays 2.6%, far lower than 23.3% of commercial Pt/C after 10,000 s chronoamperometry aging test.

show abstract

“…1,2 When the liquid phase is introduced into the rotor of a RPB, it is split into fine droplets, ligaments, and thin liquid films by the rotating porous packing. 3,4 As a result, the mass transfer coefficient and micromixing efficiency of a RPB are up to 1-3 orders of magnitude in comparison with a traditional packed bed. [5][6][7] RPBs have been widely used for gas-liquid, liquid-liquid, and gas-liquid-solid systems, such as absorption 8 and distillation, 9 condensation reaction, 2 production of nanoparticles, 10 and catalytic hydrogenation.…”

Section: Introductionmentioning

confidence: 99%

“…A rotating packed bed (RPB) is regarded as an excellent device for chemical process intensification . When the liquid phase is introduced into the rotor of a RPB, it is split into fine droplets, ligaments, and thin liquid films by the rotating porous packing . As a result, the mass transfer coefficient and micromixing efficiency of a RPB are up to 1–3 orders of magnitude in comparison with a traditional packed bed .…”

Section: Introductionmentioning

confidence: 99%

A three‐zone mass transfer model for a rotating packed bed

et al. 2019

View full text Add to dashboard Cite

A rotating packed bed (RPB) is recognized for its merits in chemical process intensification. In most studies of RPB mass transfer modeling, however, the effects of the end and cavity zones have not been taken into consideration, since it was very difficult to distinguish the end and bulk zones by hydrodynamics and mass transfer process. In this work, the radial thickness of the end zone was obtained by developing a probability method and imaging experiments to separate the end and bulk zones. A three-zone model, including end, bulk, and cavity zones, of the overall gas-side volumetric mass transfer coefficient (K G a)t was first established. Experiments of dissolved MEA chemisorption of CO 2 were carried out to validate the proposed three-zone mass transfer model. The results of the MEA-CO 2 absorption experiments showed that the experimentally obtained values of CO 2 absorption efficiency were in agreement within ±20% with the model predictions.

show abstract

Dynamics of droplets and mass transfer in a rotating packed bed

Cited by 29 publications

References 45 publications

A mesoscale 3D CFD analysis of the liquid flow in a rotating packed bed

A mesoscale 3D CFD analysis of the liquid flow in a rotating packed bed

Bimetallic Fe and Co supported on the N‐doped mesoporous carbon frameworks with enhanced oxygen reduction reaction performance via high‐gravity technology

A three‐zone mass transfer model for a rotating packed bed

Contact Info

Product

Resources

About