Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ASSESSMENT OF MATHEMATICAL METHODS TO ESTIMATE THE SMOKE LAYER THICKNESS IN DIFFERENT FIRE SCENARIOS
Submission Author:
Diego Alex Henz , AC
Co-Authors:
Diego Alex Henz, Jéssica dos Reis, Felipe Roman Centeno
Presenter: Diego Alex Henz
doi://10.26678/ABCM.COBEM2019.COB2019-0235
Abstract
Smoke is one of the leading causes of fire deaths. The knowledge of the thickness of the smoke layer is of great importance, since it is possible to know the thermal and flow profile of the same, as well as design smoke control devices and minimize the problems caused by it. In the present work the thickness of the smoke layer is determined by 4 methods: N-percentage rule, Buoyancy Frequency, Integral Ratio and the standard method of FDS (Fire Dynamics Simulation) software. The fire scenarios employed to test those methods were taken from experiments available in the literature, which vary in shape, ventilation and heat release rate: a tunnel, a building and an atrium. The general behavior obtained with the different methods was quite similar for all fire scenarios, showing that there is not a most accurate method that can be applied for any fire scenario, while all methods agreed at least qualitatively with the experimental transient smoke layer heights. Despite that, the standard method of FDS and the N-percentage rule (depending on the choice of N) provided relative errors slightly smaller than the other methods.
Keywords
Smoke Layer, FDS, N-percentage Method, Integral Ratio Method, Buoyancy frequency method
