Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
NUMERICAL INVESTIGATION OF THE INFLUENCE OF THE GEOMETRY ORIENTATION ON THE HEAT TRANSFER OF A VISCOPLASTIC FLUID
Submission Author:
Luiz Paulo Borges Miranda , MG , Brazil
Co-Authors:
Marcos Vinicius Teixeira Maciel, Luiz Paulo Borges Miranda, Daniel Dall Onder dos Santos, Flavia Zinani
Presenter: Marcos Vinicius Teixeira Maciel
doi://10.26678/ABCM.COBEM2021.COB2021-0408
Abstract
It is known that non-Newtonian fluids comprise a wide range of applications in several industrial sectors. In this way, the study of non-Newtonian fluids has a great horizon of discoveries to be explored. In the present work, a yield stress flow is analyzed, motivated by its industrial interest, in particular at the food industry that processes and transports its products with the aid of pipelines. A numerical model was used to solve a viscoplastic flow inside a planar channel with an expansion followed by contraction. To model the viscoplastic behavior, the SMD function was chosen. This model has interesting properties for its application on numerical methods and all its parameters are rheological parameters. The OpenFOAM software was selected to perform all the simulations once it is one of the best open-source software for computational flow dynamics, and its characteristics are particularly fitted for non-Newtonian simulations. Five dimensionless parameters were used to define the flow: the Prandtl number, the Reynolds number, the plastic number, the Richardson number and the Jump number. The cavity walls and the fluid at the inlet are kept at different temperatures, and the channel walls are considered insulated. The mixed convection effect is analyzed for the different geometry orientations in terms of the average Nusselt number, the head loss (a measure of the expansion-contraction influence on the flow pressure drop), and the displacement efficiency (the ratio between the portion of the cavity with the shear stress higher than the yield stress and the total area of the cavity).
Keywords
Mixed Convection, planar channel, Yield Stress Fluids, SMD model
