Study of the effects of walls on vortex formation and liquid maldistribution with two-phase flow around a spherical particle via numerical simulation

He, Guangping; Mo, Hanyang; Zhang, Rongrong; Jin, Haibo; Du, Wei

doi:10.1016/j.powtec.2019.05.070

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…In recent years, computational fluid dynamics (CFD) and simulation approaches have emerged as cost-effective and convenient alternatives, gaining attraction in various fields. − Hanbin Zhong et al employed CFD to simulate the instantaneous yield of bio-oil in fluidized biomass pyrolysis, and further optimized their simulation by using long short-term memory network methods based on CFD data, thereby significantly reducing computational time . This powerful technique has also proven effective for TBR research, providing detailed information about the processes within the reactor. − Simulation approaches have been used to investigate the effects of gas and liquid feeds, particle arrangement, reactor temperature, and pressure on the liquid flow process. ,− Nonetheless, the mechanisms underlying liquid flow require further elucidation. Therefore, studies that focus on liquid distribution on a single particle can contribute to the deep understanding of the liquid flow characteristics in TBR.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Liquid Flow Characteristics on a Single Spherical Particle for Trickle Bed Reactor

Wei,

Shi,

Guo

et al. 2023

Ind. Eng. Chem. Res.

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Liquid distribution plays a crucial role in the performance of the trickle bed reactor (TBR). Therefore, understanding the flow behavior of a droplet impacting a spherical catalyst particle in the TBR is essential for the design and operation of the reactor. In this study, the volume of fluid (VOF) model was used to investigate this phenomenon. The simulation results revealed two distinctive flow patterns: a uniform liquid film flow pattern and a droplet flow pattern. To quantitatively evaluate the two flow patterns, a postprocessing method was proposed based on the Fibonacci sequence. The results indicate that the uniform liquid film flow pattern can maintain larger total gas–liquid interfacial area and specific interfacial area (thinner liquid film) for a longer residence time compared to the droplet flow pattern, demonstrating that the uniform liquid film flow pattern is a promising way to optimize the TBR performance. To facilitate the formation of a uniform liquid film on the particle, using liquids with smaller contact angles, lower surface tension, and adjusting the droplet/particle size ratio to a suitable range can be suggested.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Liquid Flow Characteristics on a Single Spherical Particle for Trickle Bed Reactor

Wei,

Shi,

Guo

et al. 2023

Ind. Eng. Chem. Res.

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show abstract

“…With the drawback of a high cost and unsafety, the performance of these techniques depends on the complexity of the reconstruction algorithms. Compared to these approaches, computational fluid dynamics (CFD) modeling has a relatively low cost and can simulate both realistic and ideal conditions [10][11][12][13][14]. However, a CFD simulation of the full geometry of a gas-liquid distributor may be time-consuming, depending on the domain size and the mesh number.…”

Section: Introductionmentioning

confidence: 99%

A Closed-Loop Optimized System with CFD Data for Liquid Maldistribution Model

Zhang

et al. 2020

Processes

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For the simulation of a trickle-bed reactor (TBR) in coal and oil refining, modeling the liquid maldistribution of the gas-liquid distributor incurs enormous pre-processing work and bears a huge computational cost. A closed-loop optimized system with computational fluid dynamic (CFD) data is therefore proposed for the first time in this paper. A fast prediction model based on support vector regression (SVR) is developed to simplify the modeling of the liquid flow rate in TBRs. The model uses CFD simulation results to determine an optimized set of structural parameters for the gas-liquid distributor in TBRs. In order to obtain an accurate SVR model quickly, the particle swarm optimization (PSO) algorithm is employed to optimize the SVR parameters. Then, the structural parameters corresponding to the minimum liquid maldistribution factor are calculated using the response surface methodology (RSM) based on the hybrid PSO-SVR model. The CFD validation results show a good agreement with the values predicted by RSM, with liquid maldistribution factors of 0.159 and 0.162, respectively.

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A numerical study of the mechanism of liquid film spread and distribution on spherical particles including wall effects

Zhang

et al. 2020

Powder Technology

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Study of the effects of walls on vortex formation and liquid maldistribution with two-phase flow around a spherical particle via numerical simulation

Cited by 4 publications

References 29 publications

Numerical Simulation of Liquid Flow Characteristics on a Single Spherical Particle for Trickle Bed Reactor

Numerical Simulation of Liquid Flow Characteristics on a Single Spherical Particle for Trickle Bed Reactor

A Closed-Loop Optimized System with CFD Data for Liquid Maldistribution Model

A numerical study of the mechanism of liquid film spread and distribution on spherical particles including wall effects

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