Experimental study on the dynamic characteristics of wall normal stresses during silo discharge

Wang, Xin; Liang, Cai; Guo, Xiuqi; Chen, Yangyang; Liu, Daoyin; Ma, Jiliang; Chen, Xiaoping; An, Haiquan

doi:10.1016/j.powtec.2020.01.023

Cited by 18 publications

(8 citation statements)

References 28 publications

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“…Since the organic glass silos are convenient to observe the flow patterns of storage materials and to study the wall normal stresses during silo discharging 14 , 29 – 33 , the organic glass, whose elastic modulus( E ) and Poisson’s ratio( v ) are 2.758 × 10 3 (MPa) and 0.29, respectively 29 , is selected to make the model silo. Three columns of sensors A, B and C are arranged along the height direction of the silo wall.…”

Section: Resultsmentioning

confidence: 99%

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

Liang

2022

Sci Rep

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For the shallow and circular silo (SCS), when the aspect ratio is between 1.0 and 1.5, the lateral pressure especially dynamic pressure may cause destruction if the size of the silo is large. This paper proposed a modified calculation method of lateral pressure on the silo wall of SCS, considering the elasticities of silo wall and storage materials. The availability of shallow silo and deep silo methods, and the modified method were compared with the experiment and simulation. The results show that the Rankine’s formula is too conservative for the static lateral pressure, and the results of the modified method and Janssen formula are close to that of the experimental and simulation. For the dynamic lateral pressure calculation, Rankine theory is unsafe for the discharging load. The relative error of the dynamic lateral pressure based on Janssen theory is between 20 and 30%, which is too large. The dynamic lateral pressure calculated by the modified method is in good agreement with that of the experimental and simulation, and the relative error is less than 10%. Therefore, the modified method of lateral pressure formula is reasonable, which can provide guidance for the safety design of silo structure.

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Section: Resultsmentioning

confidence: 99%

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

Liang

2022

Sci Rep

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“…Qualitatively, this phenomenon is similar to what appears during the mass/semi‐mass flow discharge. It has been well recognized that for mass/semi‐mass flow mode, the most violent fluctuation of wall normal pressure appears at the ETP at which the flowing zone starts to converge downwardly 4,6,11–13 . The severe pressure fluctuation is generally attributed to the direction change of the major principal stress of the bulk material: the direction of the major principal stress turns from vertical (above EPT) to horizontal (below EPT), leading to the formation of shear zones in the converging part 6 .…”

Section: Discussionmentioning

confidence: 99%

“…Because of the converging cross‐section of the flowing zone, shear zones emanating from the silo wall might be created at ETP, expand toward the interior of bulk solids, and move downward 6 . The alternating flow pattern mechanism states that the intermittent formation of shear zone at ETP is the direct source of the strong fluctuations of wall stress and particle velocity 11–13 . The free‐fall arch mechanism assumes that right above the outlet, there exists a region where force chain network appears intermittently.…”

Section: Introductionmentioning

confidence: 99%

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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“…Since the organic glass silos are convenient to observe the flow patterns of storage materials and to study the wall normal stresses during silo discharging [14,[26][27][28][29][30], the organic glass, whose elastic modulus(E) and Poisson's ratio(v) are 2.75810 3 (MPa) and 0.29, respectively [26], is selected to make the model silo.…”

Section: Experiments Verificationmentioning

confidence: 99%

“…However, the storage materials are large numbers of particle aggregates, and their mechanical properties are extremely complex, which is difficult to reasonably estimate using the traditional classical mechanics theory and condensed matter physics theory [12]. In recent years, relevant scholars have found that the maximum dynamic pressure on the silo wall is often several times of the static pressure during silo discharging [13][14][15][16]. Thus, if the dynamic pressure on silo wall is not considered during the design process, it will lead to the instability of the silo.…”

Section: Introductionmentioning

confidence: 99%

Modified Lateral Pressure Formula of Shallow and Circular Silo Considering the Elasticities of Silo Wall and Storage Materials

Liang

2021

Preprint

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For the shallow and circular silo(SCS), when the aspect ratio is between 1.0 and 1.5, the lateral pressure especially dynamic pressure may cause destruction if the size of the silo is large. In general, the lateral pressures should be calculated simultaneously according to the shallow silo and the deep silo calculation formulas based on Rankine’s earth pressure theory and Janssen’s theory, respectively, and the larger value of them should be adopted. However, whether the two formulas are reasonable needs to be verified. This paper proposed a modified calculation method of lateral pressure on the silo wall of SCS, considering the elasticities of silo wall and storage materials. The availability of shallow silo and deep silo methods, and the modified method were compared with the experiment and simulation. The results show that the Rankine’s formula is too conservative for the static lateral pressure, and the results of the modified method and Janssen formula are close to that of the experimental and simulation. For the dynamic lateral pressure calculation, Rankine theory is unsafe for the discharging load. The relative error of the dynamic lateral pressure based on Janssen theory is between 20% and 30%, which is too large. The dynamic lateral pressure calculated by the modified method is in good agreement with that of the experimental and simulation, and the relative error is less than 10%. Therefore, the modified method of lateral pressure formula is reasonable, which can provide guidance for the safety design of silo structure.

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Experimental study on the dynamic characteristics of wall normal stresses during silo discharge

Cited by 18 publications

References 28 publications

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

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

Modified Lateral Pressure Formula of Shallow and Circular Silo Considering the Elasticities of Silo Wall and Storage Materials

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