Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
FORECASTING THE LENGTH OF THE UNDEVELOPED FLOW REGION IN THE INLET OF ASYMMETRIC BIFURCATIONS I
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.ENCIT2018.CIT18-0008
Abstract
Usually, equations for prediction of the undeveloped flow region length, presented in the literature for laminar regime in curved tubes, show that this extension is a function of the flow velocity (expressed by the Reynolds number), the pipe diameter (hydraulic diameter if section is not circular) and the segment curvature radius. Thus, an equation in the classical format is proposed to predict the length of the not fully developed flow region in asymmetric bifurcations of tubes with 20 mm in diameter. Simulations in finite difference method were performed for several angles and flow rates, as well as simulations in a commercial code, for comparison of results. Constants and exponents were calculated from the measurement of the region of interest in images generated in the models. The size of the region was larger as the fork angulation increased. Flow rate, within the range tested, was not as influential. A complementary work must be carried out in order to raise the effect of the diameter of the pipe and thus, reach a more adequate equation, which takes into account all the variables that matter to the phenomenon.
Keywords
flow development, Bifurcations
