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research-article

Study of the dynamic and thermal behavior of an air flow in a Tbifurcation

[+] Author and Article Information
Ali Riahi

Laboratory of Energy, Thermal and Mass Transfers of Tunis Faculty of Sciences of Tunis, Campus University, 1060 Tunis, University of Tunis El Manar; Faculty of Science of Bizerte-Zarzouna-Bizerte-7021, University of Carthage
aliriahi1989@gmail.com

Julien Pellé

LAMIH UMR CNRS 8201 - Université Polytechnique HAUTS-DE-FRANCE
julien.pelle@univ-valenciennes.fr

Lillia Chouchane

Laboratory of Energy, Thermal and Mass Transfers of Tunis Faculty of Sciences of Tunis, Campus University, 1060 Tunis, University of Tunis El Manar; Faculty of Science of Bizerte-Zarzouna-Bizerte-7021, University of Carthage
liliachouchane@gmail.com

Souad Harmand

LAMIH UMR CNRS 8201, University of Valenciennes and Hainaut-Cambrésis, France
souad.harmand@univ-valenciennes.fr

Sadok Ben Jabrallah

Laboratory of Energy, Thermal and Mass Transfers of Tunis Faculty of Sciences of Tunis, Campus University, 1060 Tunis, University of Tunis El Manar; Faculty of Science of Bizerte-Zarzouna-Bizerte-7021, University of Carthage
sbenjabrallah@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4040481 History: Received September 08, 2017; Revised May 31, 2018

Abstract

This paper presents a numerical and experimental study of a turbulent flow of air in a Tbifurcation. This configuration corresponds to the radial vents placed in the stator vertically to the rotor-stator air gap in the electrical machines. Indeed, our analysis focuses on the local convective heat transfer on the vents internal surface under a turbulent mass flow rate. In order to dimension the cooling installation of this region, computational fluid dynamics (CFD) simulations and an experiment using particle image velocimetry (PIV) have been carried out. The resulting flow generally being the seat of recirculation zones in the various channels. The influence of the flow ratio and the diameter of the bifurcation on the dynamic and thermal behavior of the flow was. To carry out this study, we considered a numerical approach based on the KW-SST turbulence model (using commercial software, "Comsol Multiphysics"), allowing to numerically solve the Navier-Stokes equations and the energy equation in the system under consideration. We describe the different hypotheses necessary to formulate the equations governing the problem, the initial conditions, and the limits. The velocity in the bifurcation obtained using the simulation is compared with that obtained by the experiment and reveals a good agreement. The effect of branch diameter of the bifurcation and the effect of the flow ratio of heat transfer have been particularly analyzed in this paper.

Copyright (c) 2018 by ASME
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