Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Numerical Simulations of Unsteady-Flows of Herschel-Bulkley Fluid in a Taylor-Couette Geometry
Submission Author:
Felipe Rezende de Loyola , PR , Brazil
Co-Authors:
Felipe Rezende de Loyola, Waldyr De Lima e Silva Junior
Presenter: Felipe Rezende de Loyola
doi://10.26678/ABCM.COBEM2019.COB2019-1069
Abstract
In the present work, the periodic flow pattern of a top-load vertical axis washing machine is numerically modeled as the so-called Taylor-Couette flow by means of the mass and momentum transport from an agitator to the fluid stream. The characterization procedure of the fabric-water mixtures fluid flow, within the washing machine, as a Herschel-Bulkley fluid model demonstrated that is capable to reproduce such a complex flow behavior with a satisfactory degree of reliability. Moreover, the fabric dispersal and deformation on water according to the applied shear stress from the spin bowl may be seen as the change of the apparent viscosity in the physical domain. Therefore, the computed rheological behavior of different fabric-water mixtures from periodic simulations, which attempts to simulate a complete cycle of a real washing machine agitation profile, were analyzed. The rheological mixtures characterization was obtained from previous work. Higher values of the apparent viscosity were observed in regions near the agitator and the bottom surface, thus pointing out where the efforts to enhance the mechanical washing efficiency should be addressed.
Keywords
Rheology, Herschel-Bulkley model, Periodic Flows, numerical simulations
