| The use of water mist (very fine water sprays) for fire suppression is currently receiving increased attention as a replacement technology for halogen-based chemical agents - such as Halon 1301 (CH3Br) the manufacturing of which has been banned by the Montreal Protocol due to their high ozone depletion potential. Water mist technology has been found more advantages such as not contaminating the environment, not destroy the ozone layer, not bring green house effect, fast extinguish, low water consumption, and be safe to the man and other protected objects, it has been received considerable attentions among international fire science research. This article belongs to the field of the science of fire, and is supported by the science fund of Jiang-Su province. According to the objects and requests of the project, an experimental system of water mist was set up. A series of pilot experiment for observing the interaction of water mist with wood fire was conducted. Thermocouples and digital video were used to measured the characteristic parameters of the burning area and the temperature of the mood. Experiments indicated that the pre-buming time, the interaction time, and the flux of mist significantly affected the course of extinguishment. The main mechanism of extinguishment was the surface cooling effect. A simplified theoretical model for the change of the interior of the wood was developed based on heat transfer theory, and the calculated values were in good agreement with the experimental results.
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