Abstract：Numerical simulation on cooling effect by fine water mist in outdoor environment was carried out under real physical condition and the Realizable k-ε model. Discrete particle model in Fluent was used to simulate the status of fine water mist transportation and the characteristics of heat and mass transfer in outdoor environment. The flow,temperature and humidity fields were simulated. In addition,the human comfort index of cooling effect was predicted. The simulation results show that the evaporation of small size droplets takes place in the zone of flow establishment and transition,and the evaporation of large size droplets occurs in the back flow zone. With the increasing of droplets diameter,the evaporation time of droplets prolongs,cooling effect is more evident and cooling space is expanded. With the increa-sing of droplets diameter,the extent of humidifier expands,the range of humidifier keeps constant,and the relative humidity in local environment increases very little.The technology of fine water mist cooling in outdoor environment will reduce the human comfort index and improve the quality in outdoor environment effectively.
2009, Vol. 30 
