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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Qualitative Analysis of The Region of Flow Development in The Entrance of Bifurcations
Submission Author:
Flavio Peres Amado , RJ , Brazil
Co-Authors:
Flavio Peres Amado, Victor Hugo Mondaini Corradi
Presenter: Flavio Peres Amado
doi://10.26678/ABCM.ENCIT2020.CIT20-0025
Abstract
In previous works published in the last four years, the authors, as well as other collaborating partners, have been doing equations surveys to predict the extension of the flow developing region at the entrance of bifurcations. Initial conditions were adopted for artisanal simulation via finite differences, which consider that the flow is deformed when entering the outlet, in proportion to its half-angle. Now using a new approach, this work intends to make a qualitative analysis of the flow developing region, considering CFD simulation in which an elementary volume, when reaching the end of the feeder channel, will have an equal possibility of going through the right or left channel. In the simulations, a standard asymmetric bifurcation was used, with the diameter of the feeder channel equal to the outlets diameters, with water flowing under NTP conditions. Images published in the specialized literature show that the main flow tends to touch the internal wall of the bifurcated channel and that the greater the half angle of the fork, the greater the formation of vortices next to the external wall. In the present qualitative analysis, this phenomenon is confirmed and it is shown in complementary images that the flow developing region grows proportionally to the growth of the flow rate in the feeder channel, as well as it is proportional to the growth of the tube diameter and inversely proportional to the growth of the half-angle that constitutes the structure. Given that all previous work done in this area by the author is basically quantitative, this qualitative analysis aims to complement the service and advance the state of the art of the matter
Keywords
flow development, Bifurcations, Qualitative Analysis
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