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Dissertation/Thesis Abstract

An integral model for turbulent flame radial lengths under a ceiling
by Ding, Haiwen, M.S., University of Maryland, College Park, 2010, 73; 1478933
Abstract (Summary)

An analytical study using an integral model for turbulent flame radial lengths under a ceiling is presented. Dimensionless equations give results in terms of Q* -- dimensionless firepower, and D/H -- the ratio of fire diameter to ceiling height. The model used an empirical relationship for the mixing ratio of air entrained to stoichiometric air needed for the ceiling jet flame. This value varies from 9.6 for short radial flames to 1 for long flames that tend to become laminar. Predictions from the model are in good agreement with the experimental data from previous work found in the literature. They span a range that contains data where the fire plume flame just touches the ceiling to the case where long ceiling flames become laminar. An alternative empirical fit of the theoretical results finds that the radial flame length is independent of ceiling height once the flame hits the ceiling.

Indexing (document details)
Advisor: Quintiere, James G.
Commitee: Marshall, Andre W., Sunderland, Peter B.
School: University of Maryland, College Park
Department: Fire Protection Engineering
School Location: United States -- Maryland
Source: MAI 48/06M, Masters Abstracts International
Subjects: Engineering, Mechanical engineering
Keywords: Ceiling jet, Entrainment, Fire plume, Flame length, Richardson number, Turbulent mixing
Publication Number: 1478933
ISBN: 978-1-124-09139-6
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