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THMT-15. Proceedings of the Eighth International Symposium On Turbulence Heat and Mass Transfer
September, 15-18, 2015, Sarajevo, Bosnia and Herzegovina

DOI: 10.1615/ICHMT.2015.THMT-15


ISBN Print: 978-1-56700-427-4

ISBN CD: 978-1-56700-428-8

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

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