Experimental and numerical study of coarse particle conveying in the small absorber sphere system: Overview and some recent CFD-DEM simulations

Li, Tianjin; Zhang, He; Kuang, Shibo; He, Yan; Diao, Xingzhong; Huang, Zhiyong; Bo, Hanliang; Dong, Zhe

doi:10.1016/j.nucengdes.2019.110420

Cited by 11 publications

(6 citation statements)

References 80 publications

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“…The equations of the mass conservation and the momentum conservation in terms of local mean variables in a computational cell for the gas phase are solved as where ρ is the gas density (kg m –3 ), ξ is the volume fraction of gas, u is the gas velocity (m s –1 ), p is the gas pressure (N m –2 ), τ is the stress tensor (N m –2 ), g is the gravitational acceleration (m s –2 ), and F D , F L , and F M are the drag force (N), lift force (N), and Magnus force (N) acting on the particles, respectively. The above symbols described in equations have been introduced in detail by a number of studies. ,,, …”

Section: Methodologiesmentioning

confidence: 99%

“…The four-way coupling CFD-DEM simulation has been employed to be a verified method for gas–solid two-phase flow analysis. Numerous studies have examined this simulation for conveying motion in a gas flow, such as by Zhou et al, − Chu et al, and Li et al To validate the numerical simulation properties, the results of the simulations and experiments were compared. The authors have experimentally examined the lump coal pickup characteristics in an axial airflow and swirling flow .…”

Section: Methodologiesmentioning

confidence: 99%

“…The above symbols described in equations have been introduced in detail by a number of studies. 36,42,45,46 The translational and rotational motions of particles are described.…”

Section: Methodologiesmentioning

confidence: 99%

See 2 more Smart Citations

Pickup Characteristics of Lump Non-spherical Particles in an Oscillating Airflow

Zhou

Shangguan

Gao

et al. 2020

Ind. Eng. Chem. Res.

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The pickup characteristics of lump non-spherical particles in an oscillating airflow were numerically studied on the basis of experimental verification. Five typical shapes of lump coal particles with diameters of 5−7 mm were numerically calculated. The impact of the oscillating amplitudes and the frequencies was discussed. The oscillating number was first defined to quantitatively examine the oscillating intensity. Two points are worth highlighting: (1) the increase in the particle pickup ratio caused by the strength interaction intensity mostly prioritized the particle pickup process in an oscillating airflow. Particles were liable to be entrained, but this process was weakened in the continuous pickup process in a high-frequency rectangular wave airflow. (2) A significant consistent regression relationship was observed in both the swirling airflow and oscillating airflow in which the particle pickup velocity increases at first and then decreases with both the oscillating number and swirling number.

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Section: Methodologiesmentioning

confidence: 99%

Section: Methodologiesmentioning

confidence: 99%

See 1 more Smart Citation

Pickup Characteristics of Lump Non-spherical Particles in an Oscillating Airflow

Zhou

Shangguan

Gao

et al. 2020

Ind. Eng. Chem. Res.

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“…Li et al [21] also studied the ballast adsorption phenomenon and flow process in the gas-solid two-phase flow vortex through this method. Li et al [22] introduced a specific application of the CFD-DEM method to transport ballast adsorbents in gas-cooled reactors in nuclear engineering. Naukkarinen et al [23] used this method to study the ballast filtration process of the ion membrane.…”

Section: Introductionmentioning

confidence: 99%

Ballast Pick-Up Velocity in the Vertical Pipe of an Excavating Machine Slurry System

Wang¹

2023

Preprint

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Abstract：Ballast pick-up velocity is a crucial parameter in the design of a slurry system in excavating devices, it influences transportation stability, safety, and economy of the system. In this study, a vertical pipe hydraulic experiment with different ballast sizes under water condition was conducted to investigate the ballast pick-up velocity in the shield slurry system. Thereafter, the coupling method of computational fluid dynamics and the discrete element method (CFD-DEM) was employed to establish a numerical model of the ballast pick-up velocity in the shield slurry system, and its applicability was verified by comparing the experiment results. Additionally, the ballast pick-up process under actual working conditions was studied, and the influence of ballast size and concentration on pick-up velocity was investigated. Overall, the primary findings of the study are as follows: 1) The numerical method can be applied to predict both the single ballast and ballast group pick-up velocity. 2) The pick-up process of the ballast group can be divided into four stages. 3) The conveying velocity of the ballast should be higher than the pick-up velocity of the single ballast to facilitate smooth discharge. 4) For a certain increase in ballast concentration, the pick-up velocity tends to be stable.

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“…Yang et al (2012) conducted the experimental investigations on the pebble flow of a tworegion pebble bed reactor to investigate the physical mechanism of gravity-driven pebble flow by means of a set of phenomenological approaches. Li et al (2020) observed the process of granular discharging from the storage silo into the feeder by applying high-speed camera experimental method. Meanwhile, Computational Fluid Dynamics (CFD)-Discrete Element Method (DEM) coupling simulation is also conducted to investigate the coarse particle conveying in the small absorber sphere system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement on Pebble Flow Discharge in a Hopper Silo Based on a Drainage Method

et al. 2021

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The dropping of absorption sphere from the storage vessel under accident conditions and the transportation of spent fuel elements in the reactor will both lead to the pebble flow discharging process driven by gravity in a hopper silo. Therefore, the research on the gravity-driven discharging rate of pebbles in a hopper silo has significant engineering guidance for reactor safety. In general, the idea of falling pebbles weighing to obtain the discharging rate becomes the most common experimental measurement method. However, due to the limitation of response frequency and the disturbance of pebbles falling, the resolution of experimental results is limited, and the uncertainty is introduced into the data error, which is difficult to eliminate. In this experiment, a volume measurement based on drainage method is adopted. This is a new experimental method to measure the discharge process of hopper silo. The magnetostrictive liquid level sensor is applied to measure the rise of liquid level caused by the volume of falling pebbles. Compared with the weighing method, this method has two advantages. First, the resolution of this method has a higher controllability. On the one hand, the disturbance caused by the momentum of falling pebbles will not be introduced into this method, on the other hand, the measurement accuracy is determined by the multiple controllable factors. Second, this method can obtain higher measurement frequency. the sampling frequency of liquid level sensor is 1–2 orders of magnitude higher than that of electronictong balance. Based on this new experimental method, the reliability of the method is validated by comparing the experimental results of discharge flow rate with the Beverloo’s and Nedderman’s empirical formula. Furthermore, the effect of silo outlet size on pebble discharge flow rate fluctuation have been also analyzed in this study. By use of fast Fourier transform, the fluctuation of particle discharge flow rate is separated from the discharging sampling results of liquid level sensor.

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Experimental and numerical study of coarse particle conveying in the small absorber sphere system: Overview and some recent CFD-DEM simulations

Cited by 11 publications

References 80 publications

Pickup Characteristics of Lump Non-spherical Particles in an Oscillating Airflow

Pickup Characteristics of Lump Non-spherical Particles in an Oscillating Airflow

Ballast Pick-Up Velocity in the Vertical Pipe of an Excavating Machine Slurry System

Experimental Measurement on Pebble Flow Discharge in a Hopper Silo Based on a Drainage Method

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