Micro/meso simulation of a fluidized bed in a homogeneous bubbling regime
| Autor: | Michel Lance, Abdelkader Hammouti, Anthony Wachs, Amir Esteghamatian, Manuel Bernard |
|---|---|
| Přispěvatelé: | IFP Energies nouvelles (IFPEN), Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), University of British Columbia (UBC) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Fictitious domain method
Euler/lagrange method General Physics and Astronomy 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Discrete element method Fluidized bed 020401 chemical engineering 0103 physical sciences Multi-scale simulation [CHIM]Chemical Sciences Fluidization 0204 chemical engineering Fluid Flow and Transfer Processes Physics Pressure drop Mechanical Engineering Momentum transfer Particle-laden flow Mechanics [CHIM.CATA]Chemical Sciences/Catalysis Classical mechanics Flow (mathematics) Drag |
| Zdroj: | International Journal of Multiphase Flow International Journal of Multiphase Flow, Elsevier, 2017, 92, pp.93-111. ⟨10.1016/j.ijmultiphaseflow.2017.03.002⟩ |
| ISSN: | 0301-9322 |
| Popis: | International audience; Due to the wide range of spatial scales and the complex features associated to fluid/solid and solid/solid interactions in a dense fluidized bed, the system can be studied at different length scales, namely micro, meso and macro. In this work, we select a flow configuration relevant of a homogeneous liquid/solid flu- idization and compare computed results from Particle Resolved Simulation (PRS) with those from locally averaged Euler/Lagrange simulation. PRS at the micro-scale is carried out by a parallel Distributed La- grange Multiplier (DLM) solver in the framework of fictitious domain methods (Wachs, 2011a, 2015) . For meso-scale simulations, the set of mass and momentum conservation equations is averaged in control volumes encompassing few particles and momentum transfer between the two phases is modeled using appropriate drag laws. Both methods are coupled to a Discrete Element Method (DEM) combined with a soft-sphere contact model to solve the Newton–Euler equations with collisions for the particles in a Lagrangian framework ( Wachs et al., 2012 ). A test case of intermediate size with 20 0 0 spheres is chosen as a sensible compromise between size limitations of the meso-scale model for an appropriate averaging process and computational resources required to run micro-scale simulations. These two datasets yield new insight on momentum transfer at different spatial scales in the flow, and question the validity of certain approximations adopted in the meso-scale model. Results demonstrate an acceptable agreement between the micro- and meso-scale predictions on integral measures as pressure drop and bed height. Investigating more detailed features of the flow, it has been shown that particles fluctuations are consid- erably suppressed in meso-scale simulations and in particular the particles transverse motion is underes- timated, regardless of the selected drag law. The origin of these dependencies is carefully investigated by reconstructing the closure laws based on PRS results and comparing them to the closure laws proposed in the literature. |
| Databáze: | OpenAIRE |
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