Significance of a Wall Effect in Enclosures with Growing Fires

摘要

This paper studies the significance of a wall effect that has been observed during the growth stages of enclosure fire experiments. Relative to the two-layer phenomenon which tends to develop during such experiments, the effect has to do with the near-wall downward injection of hot upper layer gases into the relatively cool uncontaminated lower layer. It is conjectured that these observed wall flows are buoyancy driven, and that they develop because of the relatively cool temperature of the upper wall whose surfaces are in contact with the hot upper layer gases.