Static and dynamic pressure measurements of maize grain in silos under different conditions

Gandia, Rômulo Marçal; Gomes, Francisco Carlos; Paula, Wisner Coimbra de; Oliveira, Estácio Antunes de; Rodrí­guez, Pilar Rodriguez

doi:10.1016/j.biosystemseng.2021.07.001

Cited by 14 publications

(3 citation statements)

References 35 publications

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“…The experimental station was located at the Federal University of Lavras (Brazil) (Figure 1) and was previously validated by the members of the research group on pressures and flow in silos and stored products [29].…”

Section: Methodsmentioning

confidence: 99%

“…A pilot-scale test station, which is based on the design proposed by Pieper and Schütz in 1980 [27], is located in the Federal University of Lavras. This experimental station has been previously applied to the study of static and dynamic pressures (friction and normal) after previous calibration and verification of all instrumentation [17,28,29]; these experiments demonstrated that pressures are influenced by the slenderness and angle of the hopper. Furthermore, the DIN 1055-6: Design Basis and Actions on Structures-Part 6 [30] is partly based on studies conducted at the pilot-scale test station used by Pieper and Schütz.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Hopper Angle of a Silo on the Vertical Stress at the Cylinder-to-Hopper Transition

et al. 2022

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Silos are used worldwide to store granular and powdered materials. Agricultural, food and feed products are commonly stored in silos. However, many questions remain unanswered about how to estimate the pressures applied by the bulk material, which are needed to design and calculate the structure of the silo. The complexity of the laws that govern the mechanical behavior of the stored material along with the low number of experimental stations in the world hinder progress in this field. The aim of this study was to elucidate the relationship of the hopper angle, flow pattern and vertical stress at the cylinder-to-hopper transition in slender silos. Therefore, a set of experiments was conducted on a test station to measure the vertical stress produced by maize at the cylinder-to-hopper transition. Five different hopper angles were used. The experiments comprised the filling, the static phase and the discharge. The results obtained show that the hopper angle influences the vertical stress at the cylinder-to-hopper transition. Some bottom configurations (flat bottom and bottom with an angle of 30°) led to vertical stresses that exceeded the value calculated according to Eurocode 1. It is clear that further experimental studies are still necessary to understand the underlying physical phenomena and the relations between pressures, silo geometry and flow pattern of the stored material.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the Hopper Angle of a Silo on the Vertical Stress at the Cylinder-to-Hopper Transition

et al. 2022

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“…Tests were conducted at the test station located in the Federal University of Lavras (UFLA) in the Laboratório de propriedades físicas e de fluxo de produtos armazenados. The station was previously validated by our research team regarding pressure and flow in silos associated with stored products (Gandia et al, 2021). The station (Figure 1) consists of a storage silo where the product to be tested is stored, a bucket elevator that transports the material, and an instrumented pilot silo for pressure analysis.…”

Section: General Description Of the Installationmentioning

confidence: 99%

Experimental Pressures Exerted by Maize in Slender Cylindrical Silo: Comparison With Iso 11697

et al. 2021

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Pilot-scale test stations make it possible to obtain reliable and comparable results applicable to full-scale systems by conforming to specified proportional limits. Therefore, in this study, normal and frictional pressures were evaluated in a pilot-scale test station composed of a slender cylinder silo using maize, a free-flowing product, as the stored product. Temporal effects were analyzed and verified during filling, static, and discharge conditions. The maximum normal and frictional pressures were also evaluated. The results were compared with ISO 11697: 1995. During filling, accommodation peaks occurred only in the α: 30° hopper. In general, normal pressures were higher for the flat bottom whereas higher frictional pressures occurred for the 30° hopper. The maximum experimental pressures (normal and frictional) were lower than those provided by ISO 11697. Therefore, it is concluded that the coefficients used in the ISO standard are sufficient to promote safety in silo projects.

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Measurement of friction phenomena on silo walls made of corrugated steel

Fuentes,

Pinilla,

Madrid

et al. 2024

Computers and Electronics in Agriculture

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Static and dynamic pressure measurements of maize grain in silos under different conditions

Cited by 14 publications

References 35 publications

Effect of the Hopper Angle of a Silo on the Vertical Stress at the Cylinder-to-Hopper Transition

Effect of the Hopper Angle of a Silo on the Vertical Stress at the Cylinder-to-Hopper Transition

Experimental Pressures Exerted by Maize in Slender Cylindrical Silo: Comparison With Iso 11697

Measurement of friction phenomena on silo walls made of corrugated steel

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