Abstract
Random loose packings of monodisperse spherical micron-sized particles under a uniform flow field are investigated via an adhesive discrete-element method with the two-way coupling between the particles and the fluid. Characterized by a dimensionless adhesion parameter, the packing fraction follows the similar law to that without fluid, but results in larger values due to the hydrodynamic compression. The total pressure drop through the packed bed shows a critical behaviour at the packing fraction of ϕ ≈ 0.22 in the present study. The normalized permeability of the packed bed for different parameters increases with the increase of porosities and is also in consistent with the Kozeny-Carman equation.
Highlights
Understanding the properties of random packings of uniform spherical particles has drawing a lot of scientific attractions, since random packings are classical models of simple liquids, colloidal systems as well as granular matter [1,2,3] and occur in a variety of engineering applications including fibrous filtration, industrial manufacturing, agriculture and physics [4, 5]
In packings of large grains where elastic and frictional forces dominate, the packing fraction φ expands between two well-known limits, the random close packing (RCP) limit at φRCP ≈ 0.64 and the random loose packing (RLP) limit at φRLP ≈ 0.55 [1, 2, 6, 7]
We study the random packings of micronsized spherical particles under a uniform flow field by means of a CFD-discrete element method (DEM) coupled approach
Summary
Understanding the properties of random packings of uniform spherical particles has drawing a lot of scientific attractions, since random packings are classical models of simple liquids, colloidal systems as well as granular matter [1,2,3] and occur in a variety of engineering applications including fibrous filtration, industrial manufacturing, agriculture and physics [4, 5]. Most of the real particles in the nature are micron-sized, which are subject to elastic and frictional forces, and adhesive forces, electrostatic forces and hydrodynamic forces [4, 5]. In this case, both the structural and mechanical properties of microparticle packings could be intrinsically different in presence of such interactions. We study the random packings of micronsized spherical particles under a uniform flow field by means of a CFD-DEM coupled approach. The pressure drop through the packing as well as the permeability are analysed and discussed
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
