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Two quasi-steady states observation in an asymmetrically heated vertical channel

DOI: 10.1615/ICHMT.2015.THMT-15.740
pages 375-378

Yiqin Li
Universite de Lyon, INSA-Lyon, CETHIL, UMR5008, F-69621, Villeurbanne, France, & Agence de l'Environnement et de la Maıtrise de l'Energie , 20, avenue du Gresille, BP90406, 49004 Angers Cedex 01 France

Hervé Pabiou
Univ Lyon, CNRS, INSA-Lyon, Universite Claude Bernard Lyon 1, CETHIL UMR5008, F-69621, Villeurbanne, France

Christophe Menezo
Universite de Lyon, CNRS, France ; Chaire INSA-EDF Habitats et Innovations Energetiques, CETHIL, UMR5008, F-69621, Villeurbanne, France; University Savoie Mont-Blanc, LOCIE UMR CNRS 5271, Campus Scientifique Savoie Technolac − F- 73376, Le Bourget-du-Lac, France

Résumé

Photovoltaic double-skin fac¸ades can be modelled by considering natural convection in an open-ended vertical channel heated under isoflux conditions. Such a system is particularly challenging for numerical simulations, where turbulence may be observed for high Rayleigh numbers (Ra* > 105, Ra* being the modified Rayleigh number based on channel width, aspect ratio, and wall heat flux). We present an experimental investigation of the flow along an asymmetrically-heated vertical channel with a modified Rayleigh of Ra* = 3.3 × 107. The flow behaviour is studied through direct measurements of velocities and temperatures in the channel. The main result is the observation of two quasi-steady states that occur successively without any influence on the flow. The states are said to be quasi-steady as their durations being much longer than the time needed to switch. The shift between these states may correspond to the existence of flow reversals.

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