CFD simulation and experiment of residence time distribution in short-contact cyclone reactors

Zhang, Yuchun; Wang, Zhenbo; You-hai, Jin; Li, Zhihe; Yi, Weiming

doi:10.1016/j.apt.2015.05.009

Cited by 19 publications

(5 citation statements)

References 20 publications

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“…For the reactor wall, pole plate, and other components, the boundary condition of a standard no-slip wall was used. The second-order upwind discretization scheme was chosen for all of the equations in order to minimize numerical diffusions, and was solved with the coupled algorithm [36]. Physical parameters such as velocity and pressure were monitored in the calculation for an analysis later.…”

Section: Model Solution Proceduresmentioning

confidence: 99%

Hydraulic Characteristics, Residence Time Distribution, and Flow Field of Electrochemical Descaling Reactor Using CFD

Zhang

Wang

et al. 2021

Processes

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This paper uses computational fluid dynamics (CFD) to simulate flow field distribution inside an electrochemical descaling reactor in three dimensions. First, the reactor flow field was obtained by steady-state simulation, and the grid independence was verified. Then, the steady state of the flow field was judged to ensure the accuracy of the simulation results. Transient simulations were performed on the basis of steady-state simulations, and residence time distribution (RTD) curves were obtained by a pulse-tracing method. The effects of plate height and plate spacing on reactor hydraulic characteristics (flow state and backmixing) were investigated using RTD curves, and the results showed that increasing the plate height and decreasing the plate spacing could make the flow more similar to the plug flow and reduce the degree of backmixing in the reactor. The flow field details provided by CFD were used to analyze the reactor flow field and were further verified to obtain the distribution patterns of dead and short circuit zones. Meanwhile, information regarding pressure drops was extracted for different working conditions (490, 560, and 630 mm for pole plate height and 172.6, 129.45, and 103.56 mm for pole plate spacing), and the results showed that increasing the pole plate height and decreasing the pole plate spacing led to an increased drop in pressure. In this case, a larger pressure drop means higher energy consumption. However, increasing the pole plate height had a smaller effect on energy consumption than decreasing the pole plate spacing.

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Section: Model Solution Proceduresmentioning

confidence: 99%

Hydraulic Characteristics, Residence Time Distribution, and Flow Field of Electrochemical Descaling Reactor Using CFD

Zhang

Wang

et al. 2021

Processes

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“…The flow structures in the lab-based fluidized beds were complex [12,13] and accurate quantification of these flow structures needed to be obtained in a wide range of time and expenses scales by experimental methods [14][15][16][17][18]. In the last few years, computational fluid dynamics (CFD) has been developed to understand such intricacies because it is more flexible than experimental studies and less expensive, and it allowed process engineers to predict, manipulate, and realize the desired fluid dynamics in process equipment [19,20], which was complementary to experimental methods with the onset of better computational and experimental facilities [14,[21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Development of a novel mobile industrial-scale fluidized adsorption process for emergency treatment of water polluted by aniline: CFD simulation and experiments

Zheng

Cao

et al. 2016

Advanced Powder Technology

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a b s t r a c tThis study developed a novel mobile industrial-scale fluidized adsorption process and preliminarily explored its application in the emergency water treatment. A lab-based Liquid-Solid Circulating Fluidized Bed (LSCFB) was prepared and the flow pattern was studied by validated computational fluid dynamics (CFD) models. The simulation results revealed that the particular uneven flow structure, which could weaken aniline removal performance, occurred with increasing superficial liquid velocity. Accordingly, an optimized distributor design was constructed by the established CFD models; notably, the effect of open angles on the flow pattern, which was often overlooked by previous studies, was mainly discussed. Then, the aniline removal efficiency of LSCFB pre and post optimization was compared. The experimental results demonstrate that dynamic adsorption capacity on aniline reached 70 mg/g under the optimum conditions (initial aniline concentration of 100 mg/L, superficial liquid velocity of 3u mf and sorbent dosage of 27 g/L). By comparison with fixed-bed adsorption, the LSCFB possessed significantly higher adsorption rate constants and shorter hydraulic retention time, which indicates that LSCFB could meet emergency treatment requirements in a better way. Finally, the study developed the mobile industrial-scale fluidized adsorption process and estimated process parameters for aniline removal in the Sudden Water Pollution Accident of Zhuozhang River.

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“…Bogodage and Leung employed CFD modelling method to analyze the flow characteristics and the cyclone performance in cyclone separators with different dust outlet geometry. Zhang et al used Eulerian–Eulerian model to investigate the residence time distribution predictions of the short‐contact cyclone reactor. Luo et al adopted the CFD simulation method (volume of fluid [VOF] multi flow model) to define initial conditions of transient slug flow and discuss the slug dissipation in inlet rectifier pipe of cylindrical cyclone separator.…”

Section: Introductionmentioning

confidence: 99%

Investigation of gas–liquid two‐phase flow field behavior based on computational fluid dynamics in a water‐sparged aerocyclone

Qiu

Quan

2018

Asia-Pacific J Chem Eng

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The water-sparged aerocyclone (WSA) is a new type of high efficient gas-liquid mass transfer equipment. The focus of this paper is to investigate the gas-liquid interaction, the distribution pattern of the flow field, and the distribution characteristics of turbulent kinetic energy in the coupled space of WSA. The Reynolds stress model and the multiphase flow model of volume of fluid were employed to simulate the distribution of three-dimensional flow field in WSA, simultaneously. In present work, the numerical simulation results match well with the measured pressure drop data. The simulation results show that the symmetry of the velocity distribution of the coupled field is weakened, and the decay rate of turbulent kinetic energy is raised with the increase of gas inlet velocity. The maximum value of the axial velocity occurs a phenomenon of metastasis from the vicinity of the wall to the center of the exhaust pipe along the radial distribution. The radial velocity reaches a maximum near the center of the coupling field. The tangential velocity distribution has peak areas near the WSA wall and near the central exhaust pipe, respectively. The research results can provide the basis for the optimal design and industrial scale-up of WSA. KEYWORDS computational fluid dynamics (CFD), flow field behaviors, gas-liquid, turbulent kinetic energy (TKE), water-sparged aerocyclone (WSA)

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CFD simulation and experiment of residence time distribution in short-contact cyclone reactors

Cited by 19 publications

References 20 publications

Hydraulic Characteristics, Residence Time Distribution, and Flow Field of Electrochemical Descaling Reactor Using CFD

Hydraulic Characteristics, Residence Time Distribution, and Flow Field of Electrochemical Descaling Reactor Using CFD

Development of a novel mobile industrial-scale fluidized adsorption process for emergency treatment of water polluted by aniline: CFD simulation and experiments

Investigation of gas–liquid two‐phase flow field behavior based on computational fluid dynamics in a water‐sparged aerocyclone

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