Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Particle segregation in bidisperse narrow beds fluidized at different inclinations
Submission Author:
Henrique Barbosa de Oliveira , SP
Co-Authors:
Henrique Barbosa de Oliveira, Erick de Moraes Franklin
Presenter: Henrique Barbosa de Oliveira
doi://10.26678/ABCM.COBEM2023.COB2023-0063
Abstract
Fluidization is the suspension of solid particles by an upward fluid flow. Very-narrow fluidized beds are characterized by a close ratio between grain and duct diameters (less than 10) and are a new technology of increasing interest that can be used in chemical reactors and pharmaceutical processes. Over the last decade, most of the studies on very-narrow beds considered only vertically aligned beds, but introducing an inclination with respect to the gravity direction leads to interesting new behaviors, especially when using two types of grains (which better models real beds that are actually polydisperse). In this work, we investigate experimentally the growth of granular structures (such as granular plugs) and the motion of individual particles for very-narrow beds at various inclinations. In our experiments, the bed is filmed with a high speed camera and the images are processed to measure mean and fluctuation of grain velocities in both monodisperse and bidisperse beds, and we investigate how mixing and segregation of different species occur depending on the bed inclination and imposed flow. We observe differences in the segregation of solids for the angles tested because the layers of materials tend to align with the gravity direction, the two limits being fluidized beds in the vertical position and horizontal channels transporting grains; therefore, intermediate angles are expected to present a combination of the vertical and horizontal behaviors, leading to some degree of mixing. This is a relevant research area, as there is a great interest in understanding the mixing and segregation of polydisperse granular matter.
Keywords
Very-narrow fluidized beds, segregation, Bidisperse beds, granular matter
