Visual study of liquid flow in a rotor-stator reactor

Li, Yingwen; Wang, Siwen; Sun, Baochang; Arowo, Moses; Zou, Hai‐Kui; Chen, Jianfeng; Shao, Lei

doi:10.1016/j.ces.2015.05.046

Cited by 46 publications

(23 citation statements)

References 11 publications

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“…Further, there will also be an acceleration of coalescence–dispersion frequency among liquid elements, thus intensifying molecular collisions. Moreover, high rotational speed generates huge centrifugal force, which reduces the droplets and liquid film inside the packing to small sizes, resulting in a large surface area and enhanced micromixing process . Furthermore, as the rotational speed increases, liquid is sucked in and poured out of the packing bed at a higher speed, which leads to more cycles in RPB packing and further improves micromixing efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure c, the rotor, core component of the RPB, could produce lager centrifugal force to provide HiGee environment in radial directions . The rotor is filled by a packed bed, e.g., a multilayer of stainless steel wire mesh, through which liquid can be poured into thin films and/or tiny droplets under a strong centrifugal force (Figure d). Thus, a high surface renewing ratio of fluid elements could be achieved, resulting in intensified micromixing and further enhancement of mass transfer by up to 1–2 orders of magnitude, which is beneficial in accelerating the polymerization process and reduce reaction volume by up to 10 times for the same production with respect to conventional packed bed equipment …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

HiGee Strategy toward Rapid Mass Production of Porous Covalent Organic Polymers with Superior Methane Deliverable Capacity

Zhang

Liu

Luo

et al. 2020

Adv Funct Materials

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High porosity with well‐defined molecular reticulation along with strong stability is desired for natural gas delivery. The catalyzed Yamamoto‐type Ullmann cross‐coupling route with efficient terminal halogen removal capability is currently used to prepare porous organic materials with high specific surface area as well as ultrahigh hydrothermal stability. As a typical fast coupling reaction, the traditional stirred solvothermal approach shows the limitation of macroscopic reaction kinetics due to the increasing viscosity of the reaction mixture with the molecular network growth until it turns to a jelly‐like consistency. Herein, a high‐gravity chemical synthetic strategy to achieve rapid and economical preparation of a class of, but not limited to, covalent organic polymers (COPs) with high hydrothermal stability using the Ullman cross‐coupling route is described. The viscous fluid is vigorously split into homogeneous microdroplets through the rotating packed bed (RPB) under the HiGee environment. The HiGee approach shortens the traditional reaction time from 600 to 15 min as well as reduces the usage of high‐cost nickel (0) catalyst by 40 wt%. Specially, the COP‐10 obtained with the HiGee approach displays an excellent deliverable methane capacity of 415 cm3 STP g−1 at 298 K with working pressures 5–65 bar, which is higher than that of most reported porous organic materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

HiGee Strategy toward Rapid Mass Production of Porous Covalent Organic Polymers with Superior Methane Deliverable Capacity

Zhang

Liu

Luo

et al. 2020

Adv Funct Materials

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“…Previous studies show that the droplet tangential angle ( θ ) is an potential parameter to judge the radial thickness of the end zone because the variation of droplet tangential angle is remarkable in the end zone and almost unchanged in the bulk zone in the rotor of the RPB . We assumed that if the ratio of the tangential angle difference of liquid droplet of the adjacent two two‐packing‐layers to the tangential angle at i th packing layer is less than 0.05, as shown in Equation , the radius difference of first and i th packing layer can be regarded as the radial thickness of the end zone.

(||, \frac{θ_{i + 2} - θ_{i}}{θ_{i}}) \leq 0.05 ((), i = 2, 4, 6...24)

…”

Section: Methodsmentioning

confidence: 99%

“…The packing was added two layers by two layers closely starting from the inner packing support to avoid the deformation of one layer of the wire mesh. The total changing number of packing layers was 26.Previous studies show that the droplet tangential angle (θ) is an potential parameter to judge the radial thickness of the end zone because the variation of droplet tangential angle is remarkable in the end zone and almost unchanged in the bulk zone in the rotor of the RPB 29. We assumed that if the ratio of the tangential angle difference of liquid droplet of the adjacent two two-packing-layers to the tangential angle at i th packing layer is less than 0.05, as shown in Equation 41, the radius difference of first and i th packing layer can be regarded as the radial thickness of the end zone.θ i + 2 −θ i θ i ≤ 0:05 i = 2,4,6:::24 ð Þ ð 41Þ Figure 7b shows the top view of the packing and cavity zones of the RPB.…”

mentioning

confidence: 99%

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

et al. 2019

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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.

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“…Guo [4] found that liquid impinged and deformed intensively within the initial 7-10 mm from the inner diameter and that liquid performed two states in the packing: films on the packing surface and films flying in the gap of packing. Moreover, Li [5] investigated the effect of a various operating conditions especially for the layer numbers on the liquid patterns and drew a conclusion that the droplet was the main pattern in packing. As for recent research, Sang [6] indicated a criterion to distinguish two typical liquid patterns: ligament flow and droplet flow.The Computational fluid dynamics is called CFD for short, which is a combination of computer and numerical techniques.…”

Section: Introductionmentioning

confidence: 99%

Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

Wang

Yang

et al. 2019

Processes

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Rotating packed bed (RPB) has been demonstrated as a significant and emerging technology to be applied in natural gas desulfurization. However, droplet characteristics and principle in H2S selective absorption with N-methyldiethanolamine (MDEA) solution have seldom been fully investigated by experimental method. Therefore, a 3D Eulerian–Lagrangian approach has been established to investigate the droplet characteristics. The discrete phase model (DPM) is implemented to track the behavior of droplets, meanwhile the collision model and breakup model are employed to describe the coalescence and breakup of droplets. The simulation results indicate that rotating speed and radial position have a dominant impact on droplet velocity, average residence time and average diameter rather than initial droplet velocity. A short residence time of 0.039–0.085 s is credited in this study for faster mass transfer and reaction rate in RPB. The average droplet diameter decreases when the initial droplet velocity and rotating speed enhances. Restriction of minimum droplet diameter for it to be broken and an appropriate rotating speed have also been elaborated. Additional correlations on droplet velocity and diameter have been obtained mainly considering the rotating speed and radial position in RPB. This proposed formula leads to a much better understanding of droplet characteristics in RPB.

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Visual study of liquid flow in a rotor-stator reactor

Cited by 46 publications

References 11 publications

HiGee Strategy toward Rapid Mass Production of Porous Covalent Organic Polymers with Superior Methane Deliverable Capacity

HiGee Strategy toward Rapid Mass Production of Porous Covalent Organic Polymers with Superior Methane Deliverable Capacity

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

Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

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