Numerical Simulations of Irregular CeO2 Particle Size Distributions

Lv, Chao; Zhang, Ting‐an; Zhang, Dou; Zhao, Qiuyue

doi:10.1007/s11837-018-3194-4

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…As shown in Figure 2, the error between the simulation data of HCl and CeO2 obtained at the exit and the experimental results is less than 10%; the model selection and the setting of the boundary conditions were correct in the simulation [5].…”

Section: Validation and Optimizationmentioning

confidence: 89%

“…Many researchers have prepared the cerium oxide particles with various methods [2,3]. Cerium chloride solution obtained by extraction and separation can be used for direct pyrolysis to produce micro-and nano-meter sized cerium oxide particles [4,5]; this reduces the pyrolysis process (which includes precipitation, filtration and high temperatures) used in the traditional methods. In this process, ammonium bicarbonate and oxalic acid are not required for precipitation, thus reducing water waste and gas pollution [4].…”

Section: Introductionmentioning

confidence: 99%

“…In this process, ammonium bicarbonate and oxalic acid are not required for precipitation, thus reducing water waste and gas pollution [4]. This process utilizes a venturi jet pyrolysis reactor, which provides several advantages such as rapid reaction rates, good reaction uniformity and high product quality, as well as complete gas-phase absorption without gas escape [5]. The process of producing cerium oxides using cerium chloride pyrolysis has been validated several times with a large amount of experimental data, and it is necessary to scale up the reactors for industrial use.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Lv¹,

Zhang²,

Hao³

2019

Metals

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Micro- and nano-sized cerium oxide particles can be prepared through pyrolyzing cerium chloride solution directly in the venturi jet pyrolysis reactor. Micro- and nano-sized cerium oxide particles have better performance and higher application value. To increase the production of micro-and nano-sized cerium oxide, it is necessary to scale up the venturi jet pyrolysis reactor. According to the geometric similarity principle, the scale-up of the venturi jet pyrolysis reactors utilize dimensional analysis methods, with FLUENT13.0 and user-defined functions, following the mathematical simulation of the resulting enlarged reactors. After the dimensional analysis, the empirical formula obtained between the reactants and all the parameters is Q = 2.240727 × 10−4P0.004568ρ0.26223d−0.24801V1.25714n0.076479μ−0.26628, and the geometrical scale-up of the reactors needs to follow V = 0.0209d0.196. The results in this study can provide data support for the future optimization and amplification of reactors.

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Section: Validation and Optimizationmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Lv¹,

Zhang²,

Hao³

2019

Metals

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“…Spray pyrolysis, which involves evaporating a CeCl 3 solution in a furnace, solute precipitation, drying, metal salt decomposition, sintering, etc., can achieve continuous production. [ 16 , 17 ] The steps of preparation are simple, the time is short, and the chemical uniformity is controllable. In addition, this method ensures the independent growth of particles among atomized droplets and allows a narrow particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Green and Short Preparation of CeO2 Nanoparticles with Large Specific Surface Area by Spray Pyrolysis

Bian

et al. 2021

Materials

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Green and short preparation of CeO2 nanoparticles with large specific surface area from rare earth extraction (CeCl3) was successfully achieved by spray pyrolysis (SP). In this method, a precursor solution is first prepared by mixing CeCl3, C6H8O, and H2O in the requisite quantities. Subsequently, the precursor consisting of a mixture of CeO2 and C was obtained by SP method by using the precursor solution. Finally, the calcination at 500 °C~800 °C in air for two hours to transform the precursor to CeO2 nanoparticles. Thermodynamic analysis and experimental studies were performed to determine the optimal SP temperature and citric acid amount. The results indicated that the maximum specific surface area (59.72 m2/g) of CeO2 nanoparticles were obtained when the SP temperature was 650 °C and the molar ratio of citric acid to CeCl3 was 1.5.

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Numerical simulation of deformation and breakage of compound droplet in air flow

Lv,

Ji,

Yang

et al. 2024

Physics of Fluids

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The deformation process of compound droplets moving in air flow was studied by using volume of fluid model. In this paper, the kinetic process of air-in-liquid CeO2 compound droplets in air flow is reported by numerical simulation. First, the effects of initial velocity, initial diameter, and internal and external pressure difference on droplet behavior were studied when the compound droplets finally reached the morpho-steady state. The self-compiled program is used to process and analyze the digital image of the simulated broken image. The results show that, under the action of four main forces, namely, external aerodynamic force, internal pressure, viscous force, and surface tension, the inner surface of the hollow droplets gradually begins to break and continues to expand to the outer surface to break. With the increase in the pressure difference between inside and outside of the hollow drops, the pores are severely deformed and cracked. The increase in velocity leads to the imbalance of internal and external surface forces caused by the increase in aerodynamic fluctuation on the outer surface of hollow droplets. With the decrease in the diameter of the hollow droplet, the pressure threshold of the droplet breaking decreases and it is easier to break.

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Numerical Simulations of Irregular CeO2 Particle Size Distributions

Cited by 3 publications

References 8 publications

Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Green and Short Preparation of CeO2 Nanoparticles with Large Specific Surface Area by Spray Pyrolysis

Numerical simulation of deformation and breakage of compound droplet in air flow

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