Influence of mechanical vibrations on quasi-2D silo discharge of spherical particles

Pascot, Arthur; Gaudel, Naïma; Antonyuk, Sergiy; Bianchin, Jérémy; Richter, Sébastien Kiesgen de

doi:10.1016/j.ces.2020.115749

Cited by 19 publications

(18 citation statements)

References 43 publications

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“…A coupling with the opening size D and the frequency f is observed for the decrease of flow rate with the amplitude: the normalized flow rate decreases faster for the low frequencies and small opening sizes. Those results are in agreement with the study of Wassgren et al [17] for a 3D silo and our previous experimental results [14]. The evolution of the normalized flow rate can be scaled with the Froude number Fr = Aω/ √ gD introduced by Wassgren et al [17], as shown in figure 3b.…”

Section: First Regimesupporting

confidence: 92%

“…In addition, vibrations also increase the particle paths in the flow channel and thus the number of contacts. The scaling proposed here is quite similar to the one proposed in our previous study [14] but better captures the influence of the frequency of vibration in the second regime where shock waves propagate.…”

Section: First Regimesupporting

confidence: 78%

“…Vibrations can be applied up to a maximum relative acceleration Γ = Aω/g = 11, where g the gravitational acceleration and ω = 2π f the pulsation. This is the main change compared to the previous setup [14], which could only reach Γ = 3.3.…”

Section: Introductionmentioning

confidence: 66%

“…The opening size D of the silo can be freely changed to fit different configurations. Similarly to our previous setup [14] and other studies [3,8,10], the silo is quasi-2D with a depth W = 1.5 mm which allows the flow of only one layer of particles. This configuration allows a 2D flow which can be recorded with a camera and prevents wall effects in the other directions.…”

Section: Introductionmentioning

confidence: 90%

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Discharge of a granular silo under mechanical vibrations

2021

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In this paper, we study the flow rate of model granular material in a silo under the influence of mechanical vibrations. Experimental measurements and discrete element simulations (DEM) are performed in a quasi-2D silo. The influence on the flow rate of the opening size and the vibration applied on the entire silo is studied. Two distinct regimes are evidenced, governed by the Froude number Fr and the relative frequency Ω. In the first regime, a decreased flow rate is observed when increasing the vibration intensity. This behavior is explained by the presence of reorganizations induced by the vibration, leading to a more homogeneous but also slower flow. In the second regime, an increased flow rate is evidenced when increasing the vibration intensity. We find this behavior comes from the intermittent nature of the flow, where the flow rate is directly controlled by the propagation of shock waves all along the silo.

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Section: First Regimesupporting

confidence: 92%

Section: First Regimesupporting

confidence: 78%

Section: Introductionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 90%

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Discharge of a granular silo under mechanical vibrations

2021

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“…By use of high speed camera in a quasi-2D large silo, Zuriguel et al (2019) observed that the decreasing of orifice size causes an increase in the relative amplitude of the velocity fluctuations. Pascot et al (2020) present a study of the influence of mechanical fluctuations on a quasi-two dimensional silo discharges of granular matter. The influence of orifice shape on the flow rate in ordinary 3D flatbottom hoppers is investigated based on an electronic balance with a resolution of 1.0 g by Wan et al (2018).…”

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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Micro‐feeding of nanoparticles under ultrasonic vibration

Lu,

Zhang,

et al. 2024

AIChE Journal

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Understanding the collective flow of nanoparticles is important for handling the storing, dosing, and conveying of nanoparticles. We experimentally studied the discharge characteristics of nanoparticles from the hopper through a microchannel under ultrasonic vibration. Results show that ultrasonic vibration can effectively trigger the flow of jammed nanoparticles, which flows in the form of aggregates at a controllable discharge rate as low as 0.1 mg/s. The aggregate properties were obtained from high‐speed image processing technology. The multi‐stage flow mechanism was revealed: particle re‐arrangement at low amplitude and wall slip at high amplitude. Given this, the discharge rate model was developed by introducing an exponential function G(Fr) into the traditional Beverloo equation. The modified model describes both the self‐organized behavior at low amplitudes and velocity scaling caused by acceleration at high amplitudes, successfully predicting the discharge rate within ± 10% errors.

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Influence of mechanical vibrations on quasi-2D silo discharge of spherical particles

Cited by 19 publications

References 43 publications

Discharge of a granular silo under mechanical vibrations

Discharge of a granular silo under mechanical vibrations

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

Micro‐feeding of nanoparticles under ultrasonic vibration

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