Experimental and Numerical Investigation of Turbulent Natural Convection Flow in a Vertical Channel With a Heated Obstacle-Reference-Cited by-同舟云学术

Experimental and Numerical Investigation of Turbulent Natural Convection Flow in a Vertical Channel With a Heated Obstacle

Published:2014-08-05 Issue:10 Volume:136 Page:
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Harnane Yamina¹,Saury Didier²,Bessaïh Rachid³,Lemonnier Denis⁴,Bougriou Chérif⁵

Affiliation:

1. Assistant Professor Department of Mechanical, Faculty of Technology, University of Batna, 5, Avenue Chahid Boukhlouf, Batna 05000, Algeria e-mail:

2. Professor Pprime Institute, UPR CNRS 3346, CNRS-ENSMA-Poitiers University, Fluid, Thermal and Combustion Science Department, ENSMA, Téléport 2, 1, Avenue Clément Ader, BP 40109, Futuroscope Cedex F-86961, France e-mail:

3. Professor Laboratory of Applied Energetic and Pollution, Department of Mechanical Engineering, University of Constantine 1, Aïn El. Bey Road, Constantine 25000, Algeria e-mail:

4. Director of Research at CNRS Pprime Institute, UPR CNRS 3346, CNRS-ENSMA-Poitiers University, Fluid, Thermal and Combustion Science Department, ENSMA, Téléport 2, 1, Avenue Clément Ader, BP 40109, Futuroscope Cedex F-86961, France e-mail:

5. Professor Department of Mechanical, Faculty of Technology, University of Batna, 5, Avenue Chahid Boukhlouf, Batna 05000, Algeria e-mail:

Abstract

In the present study, experiments were carried out for natural turbulent convection induced by a heated square bar in a two-dimensional (2D) open vertical channel for different Rayleigh numbers and bar positions. For this purpose, particle image velocimetry (PIV) system has been employed to investigate the velocity field in the vertical center channel plane. The present work is also concerned with computational fluid dynamics (CFD) simulation by employing large Eddy simulation (LES) turbulence model, used in fire dynamic simulation (FDS) code. Calculations were performed for different chimney aspect ratios A* (height Lb over width d) and modified Rayleigh numbers ranging between 4 × 107 and 108. Experimental and numerical results included mean velocity profiles; flow structure and Nusselt number were presented and discussed. To validate CFD code, velocity profiles along channel elevation were compared with our experimental measurements, and a good agreement was observed. Therefore, FDS code is a useful tool to simulate natural turbulent convection dynamic field, and consequently the thermal field in such situation. CFD code has been used to study the best heated bar location (corresponding to the best cooling effect) in the channel as well as the best airflow rate. This best location and its explanation are discussed in this paper.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/doi/10.1115/1.4028022/6208447/ht_136_10_102502.pdf

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