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The influence on the fire gases temperature with respect to the surface roughness in a mine drift is investigated. A number of correlations are investigated and compared with experimental results from full-scale fire experiments. During the analysis it is found that an expression by Nunner results in predicted average fire gas temperatures closest to the measured temperatures of the two experiments. The other correlations are found to significantly over predict the average fire gas temperature. During the occurrence of backlayering the correlation by Nunner is found to predict much higher temperatures. When subtracting the energy lost to backlayering, the resulting calculated temperature curve is found to fit the measured values very well. When calculating the average fire gas temperature, a key factor is determined with respect to the smoke spread in a mine drift as well as the risk of fire spread.

The Influence of Rough Rock Surface on the Heat Losses of Fire Gases in a Mine Drift