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research-article

On Convective Heat Transfer and Flow Dynamics through a Straight T- Bifurcating Channel

[+] Author and Article Information
Lakehal Abdelhak

LMFTA, Université des Sciences et de la Technologie Houari Boumediene, PB 32 El Alia , Bab Ezzouar, Alger, Algerie
lakabdelhak@hotmail.com

Nait Bouda Nora

LMFTA, Université des Sciences et de la Technologie Houari Boumediene, PB 32 El Alia , Bab Ezzouar, Alger, Algerie
n.naitbouda@yahoo.fr

Pellé Julien

TEMPO, Université de Valenciennes et du Hainaut-Cambrésis, 59313 Valenciennes CEDEX 9, France
julien.pelle@univ-valenciennes.fr

Harmand Souad

TEMPO, Université de Valenciennes et du Hainaut-Cambrésis, 59313 Valenciennes CEDEX 9, France
souad.harmand@univ-valenciennes.fr

1Corresponding author.

ASME doi:10.1115/1.4037208 History: Received November 10, 2015; Revised June 19, 2017

Abstract

Both experimental and numerical studies of a turbulent flow in a bifurcating channel are performed to characterize the dynamical behavior of the flow and its impact on the convective heat transfer on the sides of the branch. This configuration corresponds to the radial vents placed in the stator vertically to the rotor-stator air gap in theelectrical machines. Indeed, our analysis focuses on the local convective heat transfer on the vents internal surface under a turbulent mass flow rate. The flow field measurements were carried with two components particle image velocimetry (PIV) system and the local heat transfer on the sides of the bifurcation branch was measured using an infrared thermography device. The convective heat transfer and the flow dynamics through the geometry are investigated numerically considering a three-dimensional flow. The closure system of the Navier- Stokes equations for steady and incompressible flow is based on the low-Reynolds numbers RSM-model (RSM-Stress-?). The comparison of the three-dimensional computed results with the measurements in the xy symmetry plane is satisfactory in the vertical and horizontal channels. The numerical prediction of the secondary flow in the vertical branch was analyzed and complement the experimental results. It particularly noticed that accelerated flow observed at the right side of the branch's inlet allows more pronounced heat transfer comparatively to the left side.

Copyright (c) 2017 by ASME
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