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• W181136735 abstract "Flows of granular materials exist in a wide variety of situations, spanning from industrial plants (silos, hoppers, mixers, fluidised beds) to natural processes (avalanches, rockslides), and even in everyday's life. Being that nearly a half of all goods processed worldwide are in a granular form, it is crucial both for economical and environmental issues to better understand the behavior of these materials. For large scale phenomena, continuum models (i.e. conservation equations equipped with constitutive relations) are the only affordable solution to model the flow of powders and grains.Being that the type of flow depends on the energy injected into the system, a classification was made in three regimes: 1- the rapid flow regime, for very dilute flows, 2- the quasistatic regime, for very persistent contacts, and 3- the dense flow regime, which is intermediate between the two and which, despite several attempts, lacks of a unifying and satisfying description.The present work deals with continuum modeling of dense flows of granular materials. The focus is on the development and validation of rheological models; in particular, a model taking into account the dynamics of the fluctuating energy was considered, which gave interesting results, also compared to experimental and numerical data, for both confined and free surface flow. It must be stressed that the model was applied both to simple reference geometries (inclined chute, vertical chute,..) and to industrial scale ones (silo), thus demonstrating the wide range of applicability of the approach.Then, the problem of realistic boundary conditions was thoroughly discussed, evidencing the importance of correct choices and developing an original treatment considering the effect of the fluctuating force network on slip dynamics. Moreover, due to the possibility of extending the approach to treat processes involving gas-solids flow such as moving bed reactors, an attempt was made to simply characterize coupling between gas and solids flow in vertical pipes below the fluidizatoin threshold, with the focus on gas maldistribution." @default.
• W181136735 created "2016-06-24" @default.
• W181136735 creator A5076006739 @default.
• W181136735 date "2010-01-28" @default.
• W181136735 modified "2023-09-27" @default.
• W181136735 title "Mechanics of Dense and Multiphase Flows of Granular Materials" @default.
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• W181136735 hasPublicationYear "2010" @default.
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