The shape of the cohesive arch in hoppers and silos — Some theoretical considerations

Matchett, A.J.

doi:10.1016/j.powtec.2006.10.010

Cited by 30 publications

(19 citation statements)

References 9 publications

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“…In their case the arches presumably form between grounded pressure ridges (in the East Siberian Sea), but the principle is the same as when the arches form between islands, as discussed elsewhere in this text. For an arch forming in a converging channel the strength of the structure is equal to the uniaxial compressive strength [ Matchett , ; Jenike , ]. This may not hold here since the arches are not forming in regular, converging channels, but between irregularly spaced pressure ridges.…”

Section: Introductionmentioning

confidence: 99%

A dynamical model of Kara Sea land‐fast ice

Ólason

2016

JGR Oceans

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This paper introduces modifications to the traditional viscous‐plastic sea‐ice dynamical model, which are necessary to model land‐fast ice in the Kara Sea in a realistic manner. The most important modifications are an increase in the maximum viscosity from the standard value of ζmax=(2.5×108s)P to ζmax=(1013s)P, and to use a solver for the momentum equation capable of correctly solving for small ice velocities (the limit here is set to 10−4 m/s). Given these modifications, a necessary condition for a realistic fast‐ice simulation is that the yield curve give sufficient uniaxial compressive strength. This is consistent with the idea that land‐fast ice in the Kara Sea forms primarily via static arching. The modified model is tested and tuned using forcing data and observations from 1997 and 1998. The results show that it is possible to model land‐fast ice using this model with the modifications mentioned above. The model performs well in terms of modeled fast‐ice extent, but suffers from unrealistic break‐ups during the start and end of the fast‐ice season. The main results are that fast ice in the Kara Sea is supported by arching of the ice, the arches footers resting on a chain of islands off shore.

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Section: Introductionmentioning

confidence: 99%

A dynamical model of Kara Sea land‐fast ice

Ólason

2016

JGR Oceans

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“…It is a common practice to use the Rankine equation (Eq. (15)) in routine design applications in the authors' experiences as well as in research works [13][14][15][16] to compute the normal stresses on walls, without considering the effect of slope of the walls and appropriate shearing resistance adjacent to the walls. The application of the Rankine equation gives realistic values of active stress coefficient for storage vessels with smooth vertical walls only.…”

Section: Discussionmentioning

confidence: 99%

Stress within a cohesionless granular fill in a storage vessel with sloping walls during initial static loading

2009

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“…Ambiental, v.17, n.3, p.339-345, 2013. Matchett (2007) concluiu que, apesar de diversas teorias de formação de arcos coesivos, como as de Jenike (1964), Enstad (1981) e Walker (1966) previrem a obstrução na forma de arcos circulares e, ainda, terem boa aproximação quando comparadas a situações reais, isto não significa que a hipótese de arco circular é válida para qualquer situação de descarga, pelo fato de não haver, ainda, informações experimentais das tensões no produto localizado próximo ao orifício de descarga.…”

Section: Cunclassified

Características de fluxo e projeto de tremonhas cônicas em silos verticais

Neto¹,

Nascimento²

2013

Rev. bras. eng. agríc. ambient.

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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, respectivamente, além de comparados os resultados com os obtidos experimentalmente em modelo reduzido de silo de seção semicircular. Os resultados experimentais corroboram com a metodologia de tipo de fluxo de Jenike e de tremonhas cônicas de Enstad. Os valores de orifício de descarga calculados pelo método de Jenike se demonstraram superdimensionados, sendo 45% superior ao necessário para obtenção de fluxo.

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The shape of the cohesive arch in hoppers and silos — Some theoretical considerations

Cited by 30 publications

References 9 publications

A dynamical model of Kara Sea land‐fast ice

A dynamical model of Kara Sea land‐fast ice

Stress within a cohesionless granular fill in a storage vessel with sloping walls during initial static loading

Características de fluxo e projeto de tremonhas cônicas em silos verticais

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