Características de fluxo e projeto de tremonhas cônicas em silos verticais

Neto, José Pinheiro Lopes; Nascimento, José Wallace Barbosa do

doi:10.1590/s1415-43662013000300014

Rev. bras. eng. agríc. ambient.

2013

DOI: 10.1590/s1415-43662013000300014

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Características de fluxo e projeto de tremonhas cônicas em silos verticais

José Pinheiro Lopes Neto¹,

José Wallace Barbosa do Nascimento²

Abstract: Para que projetos de silos verticais que envolvam armazenagem de produtos sólidos sejam seguros e confiáveis, é importante que se conheça o maior número de variáveis possíveis, tais como: propriedades de fluxo, geometria do silo e tipo de fluxo desejado. No intuito de validar as teorias de predição de fluxo e o dimensionamento de silos, foram determinadas as propriedades de fluxo de três produtos sólidos, analisadas e testadas as teorias de tipo de fluxo e de dimensionamento de tremonhas de Jenike e Enstad, re… Show more

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Cited by 8 publications

References 17 publications

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Conical Hopper Design for Mass Flow – Case of Red Mud

Lobato¹,

Mascarenhas²,

Mesquita³

et al. 2016

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In many cases problems in silos may occur due to improper design of its geometry due to the nonconsideration of the flow properties of the material. One of the factors that affect the flow properties of materials is the moisture content, which allows the formation of cohesive arches in the material inside the silo avoiding the desirable mass flow type. Therefore, this paper aimed to analyze the flow properties of the red mud, for different moisture levels, in order to design a hopper that provide a mass flow in conical silos. Initially, the flow properties of red mud were determined by laboratory testing using the Jenike shear tester, and then the design of the silo hopper was performed using Jenike and Enstad theories, i. e., the minimum diameter and angle of inclination of the hopper were determined for each moisture level. In order to validate the theoretical results, experimental results were obtained in laboratory for red mud powder using acrylic silos with different hoppers. The experimental results were found in good agreement with the theoretical results.

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Conical Hopper Design for Mass Flow – Case of Red Mud

Lobato¹,

Mascarenhas²,

Mesquita³

et al. 2016

HOLOS

View full text Add to dashboard Cite

show abstract

Flow Properties and Pattern Flow Prediction of Food Industrial Powders

2017

Self Cite

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More and more industries are faced with new products that need to be stored in silos which, in general, require knowledge of their physical properties and, above all, flow. Food industries are among those using powders as raw materials likely to develop functional problems. Thus, the aim of the present study was to investigate the flow properties of six food powders using equipment called Powder Flow Tester, and the results were compared with those recommended by the Eurocode 1 Part 4 international standard. Wide range of variation in the flow properties responses was observed, suggesting that their expression through a single average value may not be suitable for vertical silos. It was concluded that only the bulk density of products is in accordance with the standard. In relation to flow, only flaked corn is able to flow without possibility of obstruction in the discharge with higher discharge outlet dimensions, being also recommended for flaked oat.

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Development of an Equipment to Obtain the Relation Between the Horizontal and Vertical Pressure in Silos

2018

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Silos are essential for sectors such as agriculture, industry, and mining in Brazil, but they are structures with a high degree of complexity in relation to pressure determination. Therefore, new researches on the influence of the product stored in their structure are stimulated. For granular materials, the K coefficient is the factor obtained between the horizontal and the vertical pressure. This study aimed to develop a test device capable of calculating this coefficient based on the recommendations of EN 1991-4 (2006) (Eurocode 1: Actions on structures-Part 4: Silos and tanks). For that, two cylinders of different heights were elaborated to study the influence of the device height in obtaining K coefficient. The results were measured by strain gauges and load cell connected to a data acquisition system. A vertical pressure was applied to the equipment, which responded with values of deformation correlated to the horizontal pressure. The values of K coefficient for corn were found and compared with those from the literature, concluding that the equipment could be used for the proposed purpose.

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Características de fluxo e projeto de tremonhas cônicas em silos verticais

Cited by 8 publications

References 17 publications

Conical Hopper Design for Mass Flow – Case of Red Mud

Conical Hopper Design for Mass Flow – Case of Red Mud

Flow Properties and Pattern Flow Prediction of Food Industrial Powders

Development of an Equipment to Obtain the Relation Between the Horizontal and Vertical Pressure in Silos

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