Shape dependence of resistance force exerted on an obstacle placed in a gravity‐driven granular silo flow

Katsuragi, Hiroaki; Reddy, K. Anki; Endo, Kojin

doi:10.1002/aic.16205

Cited by 12 publications

(5 citation statements)

References 37 publications

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“…It has been found that the clogging of granular flow in silo can be significantly reduced or even suppressed by putting an obstacle at one to two times outlet size above the outlet 52,53 . For stable silo discharge, installing an obstacle at a proper position of the bottom converging zone can even lead to a higher flow rate than the case without obstacle 14,26–28 . Based on the simulation results presented here, it can be reasonably deduced that the presence of obstacle can modify the fluctuating characteristics of flow field.…”

Section: Discussionmentioning

confidence: 60%

“…Another reason triggering this research work is the hypothesis that the discharge of granular materials from silo seems to be controlled by the flow of particles in the vicinity of outlet. It has been found experimentally and numerically that the presence of obstacle at a proper position of the bottom converging zone can lead to higher flow rate than the case without obstacle 26–28 . Explanations to this counterintuitive phenomenon are generally based on contact dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Fluctuation of particles during funnel flow discharge from flat‐bottomed silos

et al. 2021

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Although resonant motion of particles during mass flow discharge from silos has been extensively investigated by earlier researchers, the appearance of such phenomenon during funnel flow discharge has not been emphasized. In this work, the flow behavior of particles during funnel flow discharge from flat‐bottomed silos has been investigated by conducting three‐dimensional Discrete Element Method (DEM) simulations. It is found that particles in the upper part of flowing zone move collectively, manifested by the oscillatory fluctuations of the velocity and the non‐Gaussian characteristics of the fluctuations of individual velocity around the average. Correlation analysis and discrete Fourier transform have been performed to characterize the emission and propagation of velocity fluctuation. It is found that the observed resonant motion of particles is induced by the regular fluctuation of contact force between particles, and there exists an intermediate region in the converging part of the flowing zone. The bottom boundary of this region corresponds to the emission source from which the velocity wave propagates upward and downward. Its upper boundary coincides with that of the converging part of the flowing zone and is featured by the most violent fluctuation of contact force. The simulation results thus suggest that the discharge of granular assembly seems to be determined by the rheological behavior of particles in this intermediate region.

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Section: Discussionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Fluctuation of particles during funnel flow discharge from flat‐bottomed silos

et al. 2021

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“…Granular flow, which enables material storage, material transfer, and on‐stream catalyst replacement (OCR), extensively exists in chemical processes, such as silo discharge, pneumatic conveying, and processes involved in moving bed reactors 1–3 . Accurate understanding of complex dynamic behaviors of granular flow is critical for the design and optimum of these processes, and numerous investigations have been carried out on this 4,5 . In a macroscopic view, Jenike et al 6 for the first time divided the particle flow patterns in silo discharging into two types including mass flow and funnel flow, and the classification and definition have been widely accepted and used in related research areas since then.…”

Section: Introductionmentioning

confidence: 99%

Dynamic densification of wet granular materials in continuous dense flows under gravity

et al. 2022

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The continuous granular flow under gravity extensively exists in chemical processes, and the dynamic behaviors of granular flow under different gas–liquid environments are investigated by synchronous slide‐type high‐speed photography. Results show that a hexagonal arrangement is observed after three‐stage densification in wet granular flow, while these structures are almost absent in the dry system. Further analysis shows that under the induction of liquid, the special cavity collapse in stage І is the pre‐condition of granular densification, and the subsequent densification in stage ІІ for the first time gives the experimental proof for the hypothesis that energy barriers exist and depend on the friction characteristics, and the cage effect in stage ІІІ provides a guarantee for the formation of a hexagonal contact network. Besides, three‐stage densification in the three‐phase system mainly occurs in the region with low gas and liquid velocities (G* < 0.716 and L* < 0.023 in this work).

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“…Saat mainan terjun payung dilepaskan, gravitasi akan mulai bekerja pada mainan tersebut. Gaya yang bekerja adalah berat mainan yang ditentukan oleh massa mainan dan percepatan gravitasi (Jing, 2021;Katsuragi, 2018;Shigorina, 2019;Wang, 2018Wang, , 2020. Gravitasi memiliki percepatan sebesar 9,8 m/s^2 di Bumi.…”

Section: Pendahuluanunclassified

Pengenalan Mengenai Gerak Vertikal Kebawah dengan Mengamati Media Mainan Terjun Payung

Nurrahmadani,

Anjarwati,

Anggraini

et al. 2023

pgsd

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Vertical downward motion is a phenomenon in physics that occurs when an object falls freely under the influence of gravity without any external force affecting it. In this article, we will look at how vertical downward motion can be observed through the use of skydiving toys. Parachuting toys are used as a safe simulation to observe vertical downward motion. This research uses a descriptive qualitative approach. This approach explains in detail the subject of vertical downward movement through parachuting. The purpose of this article is to introduce an example of vertical downward motion for elementary school children. With this article in order to introduce and invite children to play and know that what is played is an example of vertical downward motion. These toys are often designed with designs and materials that allow the opening or slowing of the fall speed. This ensures that skydiving toys are safer for children to play with. Through observing skydiving toys, we can understand the basic concepts of vertical downward motion and its characteristics such as constant acceleration, terminal velocity, and the design and material factors that affect it. In conclusion, this article shows the importance of vertical downward motion in physics and how skydiving toys can be used to observe this phenomenon.

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Shape dependence of resistance force exerted on an obstacle placed in a gravity‐driven granular silo flow

Cited by 12 publications

References 37 publications

Fluctuation of particles during funnel flow discharge from flat‐bottomed silos

Fluctuation of particles during funnel flow discharge from flat‐bottomed silos

Dynamic densification of wet granular materials in continuous dense flows under gravity

Pengenalan Mengenai Gerak Vertikal Kebawah dengan Mengamati Media Mainan Terjun Payung

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