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ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL INVESTIGATION OF THE INFLUENCE OF THE FLOW DIMENSIONLESS PARAMETERS ON THE HEAT TRANSFER OF A VISCOPLASTIC FLUID
Submission Author:
Daniel Dall Onder dos Santos , MG , Brazil
Co-Authors:
Dulles Araujo Gomes, Luiz Paulo Borges Miranda, Daniel Dall Onder dos Santos
Presenter: Daniel Dall Onder dos Santos
doi://10.26678/ABCM.ENCIT2018.CIT18-0463
Abstract
There is a significant use of non-Newtonian fluids in the industry, therefore, a study of their behavior is necessary in order to avoid errors in projects. Some of these fluids presents yield stress characteristics – the fluid must overpass a certain amount of stress to actually flow. This is called the viscoplastic behavior. This work presents a study on the influence of the rheological dimensionless quantities of a viscoplastic fluid on heat transfer. The mechanical model is approximated in a numerical simulation code called NNFEM, using the SMD viscoplastic model. The NNFEM code is based on the Galerkin least-squares methodology and it is validated in several works in the literature. The Reynolds number and the plastic number are varied individually in order to analyze the impact of these parameters on the ability to transfer heat along the flow. The adopted geometry is a planar channel which has 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 obtained results have physical meaning and are in accordance with the ones found in the literature.
Keywords
viscoplastic fluid heat transfer, Galerkin least-squares method, planar expansion-contraction, SMD model
