Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL SIMULATION OF THE PARTICLE DISTRIBUTION AND ITS EFFECT ON THE APPARENT VISCOSITY OF NON-COLLOIDAL SUSPENSIONS
Submission Author:
Nezia de Rosso , PR
Co-Authors:
Nezia de Rosso, Cezar Otaviano Ribeiro Negrao
Presenter: Nezia de Rosso
doi://10.26678/ABCM.ENCIT2022.CIT22-0139
Abstract
The current work puts forward a numerical study of a non-colloidal suspension flows in three different rheometer geometries. The inhomogeneous Euler-Euler model applied to the continuity and momentum equations is used to solve the suspension flow problem. To save computational time, the numerical domain is reduced to an extension of 1 deg in the azimuthal direction by setting rotational periodic conditions as the boundaries. The objective is to investigate the effect of shear rate and geometry in the suspensions flow and its consequence on the measured apparent viscosity. Good agreement was obtained between literature and computed apparent viscosity. Analysis of particle distribution reveals that not only the particle motion but also the apparent viscosity depends on the shear rate and the geometry. Comparisons between geometries are performed to understand the reasons behind the particle motion. Numerical simulations are conducted using common rheometer geometries, such as cone-plate, rotational parallel plate and concentric cylinders. Other parameters are also investigated, namely fluid viscosity (from 0.022 to 1.1 Pa s), particle volume fraction (from 0.1 to 0.5), and shear rates (from 10-3 to 10+3 s-1). It can be anticipated that the heterogeneous particle distribution throughout the geometries is the main cause of differences on the calculated apparent viscosity.
Keywords
suspension flow, particle motion, Euler-Euler, apparent viscosity, Simulation
