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A computational fluid dynamics (CFD) program was applied to fire spread along combustibles in a ventilated mine entry. The rate of flame spread was evaluated for the ribs and roof of a coal mine entry, timber sets, and a conveyor belt. The CFD program models char-forming materials with temperature-dependent thermal properties. The program solves three-dimensional time-dependent flow equations with a mixture fraction model for the gas phase reactions. Radiant heat exchange is evaluated for nonscattering gas. The CFD program predicted a flame spread rate of 0.0145 m/sec for an actual coal mine fire in which the estimated flame spread rate was 0.0086 m/sec. This overestimated flame spread rate was a possible consequence of the presence of inert materials in the mine entrys roof and ribs. CFD fire spread rate predictions of 0.043 m/sec and 0.73 m/sec bounded the measured value of 0.27 m/sec for fire spread along Douglas-fir timber sets in a tunnel.
| Author(s): | Edwards-JC, Hwang-CC |
| Reference: | 2006 SME Annual Meeting and Exhibit, March 27-29, St. Louis, Missouri, preprint 06-027. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2006 Mar; :1-5 |
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