Document


Title

Flame spread and burning rates through vertical arrays of wooden dowels
Document Type: Journal
Author(s): Jiang Lin ; Zhao Zhao ; Wei Tang ; Colin H. Miller ; Jin-Hua Sun ; Michael J. Gollner
Publication Year: 2019

Cataloging Information

Keyword(s):
continuous fuels; fire growth; flame spread; heat transfer; mass loss rate
Topic(s):
Record Maintained By:
FRAMES Staff; catalog@frames.gov
Record Last Modified: January 15, 2019
FRAMES Record Number: 57110

Description

Fuel loads in real-world fire scenarios often feature discrete elements, discontinuities, or inhomogeneities; however, most models for flame spread only assume a continuous, homogeneous fuel. Because discrete fuels represent a realistic scenario not yet well-modeled, it is of interest to find simple methods to model fire growth first in simple, laboratory-scale configurations. A detailed experimental and theoretical study was therefore performed to investigate the controlling mechanisms of flame spread through arrays of wooden dowels, with dowel spacings of 0.75, 0.875, and 1.5 cm. Flames were found to spread vertically for all spacings; however, for the 1.5 cm spacing, the gap was too large for horizontal flame spread to occur. A radiation-controlled model for horizontal flame spread was developed that predicted the horizontal flame spread rate through various arrays of dowels. Combined with an existing convection-based model for vertical flame spread, both horizontal and vertical flame spread was modeled to predict the number of burning wooden dowels as a function of time. Using models for the burning rate of wooden dowels and boundary-layer theory, a global burning rate model was developed that provided reasonable agreement with experimental results.

Online Link(s):
Citation:
Lin, Jiang; Zhao, Zhao; Tang, Wei; Miller, Colin H.; Sun, Jin-Hua; Gollner, Michael J. 2018. Flame spread and burning rates through vertical arrays of wooden dowels. Proceedings of the Combustion Institute online early.