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COBEM 2019
25th International Congress of Mechanical Engineering
NUMERICAL INVESTIGATION OF THE INFLUENCE OF THE REYNOLDS NUMBER ON THE HEAT TRANSFER OF A VISCOPLASTIC FLUID
Submission Author:
Luiz Paulo Borges Miranda , MG , Brazil
Co-Authors:
Luiz Paulo Borges Miranda, Daniel Dall Onder dos Santos
Presenter: Luiz Paulo Borges Miranda
doi://10.26678/ABCM.COBEM2019.COB2019-0846
Abstract
Non-Newtonian fluids are a constant presence at several industrial applications, so there is interest to understand their behavior to optimize these processes. One of these behaviors with commercial interest is the viscoplastic behavior, characterized by an abrupt change of the apparent viscosity when a certain amount of stress is achieved. The present work perform a study of the influence of the Reynolds number over some flow parameters with industrial interest. The mechanical model is approximated by the finite volume method implemented by an OpenFOAM routine developed by the authors. To model the viscoplastic behavior, the SMD model (de Souza Mendes and Dutra, 2004) was chosen. The adopted geometry is a planar channel with an expansion followed by an abrupt contraction. The channel walls are kept insulated and the heat transfer occurs only at the expansion-contraction walls. The Reynolds number was varied in order to analyze the impact of this parameter on the heat transfer, the pressure drop and the ratio between the apparent unyielded zones and the total surface of the cavity. The obtained results are in accordance with the ones found in the literature.
Keywords
viscoplastic behavior, rheological properties, SMD model, Heat transfer, expansion and abrupt contraction
