Library Subscription: Guest
Home Archives Thermal Letter Officers Future meetings Assembly for International Heat Transfer Conferences
International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

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

Hitoshi Suto
Fluid Dynamics Sector, Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-city, Chiba, 270-1194, Japan

Yasuo Hattori
Fluid Dynamics Sector, Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi, Chiba, 270-1194, Japan

DOI: 10.1615/IHTC15.ncv.008565
pages 5347-5358


KEY WORDS: Convection, Turbulent transport, Duffusion flame, Entrainment, Large-eddy simulation

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.

Purchase $25.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page