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CONV-09. Proceedings of International Symposium on Convective Heat and Mass Transfer in Sustainable Energy
April 26 - May 1, 2009, Hammamet, Tunisia

DOI: 10.1615/ICHMT.2009.CONV


ISBN Print: 978-1-56700-261-4

ISSN Online: 2642-3499

ISSN Flash Drive: 2642-3502

EXPERIMENTAL STUDY OF A THERMAL PLUME EVOLVING IN A FREE AND SEMI-CONFINED ENVIRONNEMENT: APPLICATION TO FIRES

page 14
DOI: 10.1615/ICHMT.2009.CONV.580
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ABSTRACT

The investigation purpose an experimental study of the natural convection flow. This study simulates the fires evolving in a free and unlimited environment then in interaction with their material surrounding. The fires met such as in the forests in the oil fields and in the tower blocks create a thermal plume which extends in space. The pollutants transported by the fires flows threaten the inhabitants’ health and cause a natural imbalance of the environment.
In reality the thermal plume generated by these fires undergone the influence of the neighbouring walls. Indeed, the walls which surround it are heated by thermal radiation thus creating a thermosiphon flow which interacts with the plume.
According to former work, the researchers [16, 20] noticed that the fires can be simulated by a hot source heated by Joule effect. For that, we studied the thermal plume flow generated by a hot rectangular source placed in a free then in a semi-confined environment.
To better understand the development mechanisms of the free fire flow and in interaction with surrounding, we simulated these phenomena at the laboratory.
In a first time we studied a thermal plume generated by a rectangular source heated uniformly by Joule effect. In a second time the same source is placed at the entry of a vertical canal which it's the two Duralumin walls are heated at a constant temperature.
The visualization by laser plane enables us to follow the vertical evolution of the flow for two studied configurations. Using hot wire anemometry, we explored the thermal and dynamic field of the flow. In order to better describe the fine structure of the flow, we analyzed the spectra of temperature fluctuations.

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