Heat and Mass Transfer between Water Droplet and High Temperature Environment
Water mist is a high efficiency and non-contsminative fire extinguishing agent, and its extinguishing mechanism is not clear completely. From species equation and energy equation of droplet surface, heat and mass transfer and lifetime of droplet in still high temperature environment were discussed. Using converting film theory, it is put forward that heat and mass transfer are achieved by boiling via comparison of characteristics time. Taking into accounting the coupling effect of variation of druplet diameter and velocity, heat and mass transfer of droplet within forced convection high temperature environment are studied using numerical method. The results show that it is impossible to carry out fire suppression by flame cooling and surface cooling for smaller droplet Its extinguishments depend primarily upon decalescence via gasification.
water mist heat and mass transfer extinguishing mechanism extinguishing agent
NIU Guoqing XU Zhisheng YU Minggao
School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China Disaster Prevention Science and Safety Technology Institute,Central South Umversity,Changsha 475001,
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
903-908
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）