Eventos Anais de eventos
CONEM 2018
X Congresso Nacional de Engenharia Mecânica
Developing flow in the inlet region of bifurcations of microchannels with symmetric angulation
Submission Author:
Flavio Peres Amado , RJ , Brazil
Co-Authors:
Flavio Peres Amado, Mila Avelino, Jordana Colman, EDIOMEDSON SALES, Narcisio Gregory Santos Mazzarella
Presenter: Flavio Peres Amado
doi://10.26678/ABCM.CONEM2018.CON18-0253
Abstract
The aim of this work is to evaluate the behavior of the velocity fields and predict the length of the not fully developed flow region, in the inlet of symmetric bifurcations of rectangular sectioned microchannels. An equation found in specialized literature, developed for prediction in conventional and thin curved tubes, was tested. This formulation was adapted for microtubes. Three experimental micro-devices were utilized, each fork with a larger side and a thinner side. The channel widths, flow rates and bifurcation angles were varied. Flowing were simulated via finite difference method and the lengths of the region were measured and compared to the values calculated through the proposed equation. The obtained results allowed to conclude that the equation predicts with good accuracy the length of the region of flow development, for a range of angles between 30 and 60 degrees. For the case of flow variation, it was possible to conclude that it predicted with good coincidence of results flow rates between 1.39x10-10 m3/s and 5.56x10-10 m3/s. In dimensional terms, bifurcations with outlets widths smaller than 200 microns have shown the best agreement. The applicability of the equation for asymmetric bifurcations is recommendable to be tested in future works.
Keywords
Velocity fields, Microchannel, Developing flow region, Bifurcations
