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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Large-Eddy Simulations of Plumes with and without Turbulent Diffusion Flames

Get access (open in a dialog) DOI: 10.1615/IHTC15.ncv.008565
pages 5347-5358

Abstract

Large-eddy simulations of a fire plume with flames and a buoyant plume without flames are performed. The validity of the simulations is ascertained, and the effects of the flame structure on the characteristics of a plume are then examined. Concerning the validity, the use of grid systems finer than one-twentieth of the characteristic fire diameter leads to numerical results in general agreement with the experiments. The existence of flames decreases the mean temperature and turbulence intensity and enhances the entrainment efficiency in the flame region, while it seldom affects characteristics in the plume region. Moreover, it is suggested that the enhanced entrainment efficiency is closely related to the increase in horizontal motion induced by flames.