Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Interactions of Small-Friction Particles in Very Narrow Solid-Liquid Fluidized Beds
Submission Author:
Vinícius Oliveira , SP , Brazil
Co-Authors:
Vinícius Oliveira, Fernando David Cúñez, Nicolao Lima, Erick de Moraes Franklin
Presenter: Vinícius Oliveira
doi://10.26678/ABCM.COBEM2021.COB2021-1391
Abstract
Fluidized beds are described as suspensions of solid particles (grains) in a vertical duct by an ascendent fluid flow forced against a porous plate. When those particles have a size ratio of 10 or less between tube and grain diameters, it is said that this is a very narrow fluidized bed. The bed behavior and characteristics are influenced by the interstitial fluid. If it is a liquid or has a low concentration, fluid interactions are dominant, such as drag, buoyancy and virtual mass interactions (the latter only in the case of liquids); otherwise, if it is a gas, particle interactions like shocks and solid friction are dominant. Narrow Fluidized beds have very rich dynamics both at the bed (macroscopic scale) and the grain (microscopic scale) scales, with crystallization, blockages and formation of plugs occurring at the bed scale, and shocks, sliding and vortex shedding at the grain scale. Granular systems in general have various applications in industry and possess an important role in the development of novel technologies in transport and processing of grains. This work investigates how the properties of grains influence very narrow solid-liquid fluidized beds, which have applications in wastewater treatment and sediment separation processes. This work focuses on understanding the role of friction between grains and between the grains and the wall, including the absence of friction, in very narrow solid-liquid fluidized beds. We analyze their behavior both at the macroscopic and microscopic scales.
Keywords
Fluidized Beds, Granular Systems, Contact, Fricction
