Large Eddy Simulation of Natural Extraction and Thermal Stratification Effects in Corridor Fires

Document Type : Special Issue Manuscripts

Authors

1 Laboratoire d’Energétique et des Transferts Thermiques et Massiques (LETTM), Université de Tunis El Manar, Faculté des Sciences de Tunis, El Manar II, 2092, Tunis, Tunisie

2 Laboratory of Energetics, Thermal and Mass Transfers (LETTM), University of Tunis El Manar, Faculty of Sciences of Tunis, El Manar II, 2092, Tunis, Tunisia.

3 Aix-Marseille Université, CNRS, IUSTI UMR 7343, 13453 Marseille, France

Abstract

The natural smoke extraction in a corridor with a vertical duct is analyzed numerically using the software Fire Dynamics Simulator. A parametric study is conducted to investigate the influence of the duct geometry (i.e. section, shape and height) on the smoke extraction efficiency. Results show that the section of the duct appears as the most influential geometrical parameter. There exists an optimal duct section, for which, the hot smoke adheres to the left and right walls of the duct. In this case, the mixing process and the stack effect are the dominating factors influencing the natural extraction performance. The thermal stratification is also investigated using the Newman parameter to quantify the smoke stratification stability. It was found that this parameter is predicted by the two-dimensional nature of the flow pattern in the downstream direction and that the degree of stratification decreases as the duct section and height increase.

Keywords

Journal of Applied Fluid Mechanics
Volume 12, (Special Issue)
January and February 2019
Pages 9-18

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History

  • Received: 14 December 2018
  • Accepted: 18 December 2021
  • Available online: 18 December 2021

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