Experimental analysis of natural convection and flow visualization in an asymmetrically heated open vertical channel

[+] Author and Article Information
Yassine CHERIF

Université d'Artois, F-62400 Béthune Béthune, 0000 France yassine.cherif@univ-artois.fr


Beirut Beirut, 0000 Lebanon emilio.sassine@gmail.com


Faculté des Sciences Appliquées Technoparc Futura BETHUNE, 62400 France laurent.zalewski@univ-artois.fr


IMT Lille Douai, Univ. Lille, Yncréa Hauts-de-France, EA 4515, Laboratoire de Génie Civil et géo- En Béthune, 62000 France kaies.souidi@gmail.com

Stephane LASSUE

Faculty of Applied Sciences - LGCgE - University of Artois Technoparc FUTURA Béthune, 62400 France stephane.lassue@univ-artois.fr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received October 29, 2018; final manuscript received March 29, 2019; published online xx xx, xxxx. Assoc. Editor: Sandip Mazumder.

ASME doi:10.1115/1.4043533 History: Received October 29, 2018; Accepted March 29, 2019


An experimental device was designed to perform the thermal and dynamic study of natural convection airflow in an open vertical channel. The two side walls of the vertical channel are made of Plexiglas allowing the visualization of the flow via the PIV method. For the two other vertical walls, one is heated at a constant temperature, and the other is insulated with a 9 cm thick polystyrene insulation. The dynamic characterization of convection is carried out by non-intrusive measurements (Particle Image Velocimetry (PIV)) and thermal phenomena are analyzed using non-intrusive heat flux instrumentation (Simultaneous temperature and velocity measurements have been carried out across the channel at different elevations). Moreover, this study deals with the influence of the Rayleigh number on the measured vertical velocity profiles as well as the thermal flux densities recorded along the heated wall. To do this, different values of the modified Rayleigh numbers were considered in the interval with the channel aspect ratio respectively of A= 5; and A = 12.5. The numbers of Nusselt obtained have been compared successfully with those of the literature. The effects of Rayleigh number and aspect ratio, on the velocity profiles, the convective and radiation heat transfer are examined in detail.

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