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- W12702133 abstract "The handling of bulk materials and powders in process engineering remains an important issue. To obtain reliable gravitational flows, starting and remaining stationary, the hoppers and transport channels must be designed at a scale appropriate for the friction and cohesive properties of the granular material. To describe such dense flows (the interaction with the surrounding ambient fluid is negligible compared to the weight of the particles and interparticles forces), they can be modelled by continuum mechanics, associated with a constitutive equation taking into account the friction behaviour (Mohr–Coulomb or Druger–Prager plasticity criterion). We use here the rheology proposed by Jop et al. (Nature 441: 727–730, 2006) which combines this with an associated flow rule (co-linearity of the stress and strain tensors) (Jenike, Powder Technol. 50: 229–236, 1987) and a viscous dependency of the coefficient of friction on the strain (Da Cruz et al., Phys. Rev. E 72: 021309, 2005).Using the method of characteristics to describe the flow structure (de Ryck, Granular Matter 10: 361–367, 2008), we deduce the minimal slope to obtain a stationary flow of cohesive granular materials on a finite width channel, whose lateral walls are rough or smooth. We also obtain the depth of the flow (maximal at the centre of the channel). In the case of weak cohesive materials, these results are formulated with simple analytical expressions." @default.
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- W12702133 date "2013-01-01" @default.
- W12702133 modified "2023-09-30" @default.
- W12702133 title "Onset of Stationary Flows of a Cohesive Granular Material in a Channel" @default.
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- W12702133 doi "https://doi.org/10.1007/978-3-642-34070-3_19" @default.
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