Studies have been carried out at CMU on diesel injection into high pressure and high temperature chambers with optical access, allowing study of spray characteristics, evaporation and impingement on wall surfaces. The objectives are to show that emissions of soot and hydrocarbons can be reduced by modifying spray characteristics and interaction with air flow fields. Water Mist for Fire Extinguishment S. C. Yao Fine water mist can be used in mobile systems or other difficult environments for fire extinguishment. The mist is in the order of 50 to 100 micron sizes. The use of mist is effective in fire suppression and, therefore, a very small amount of water can be used, so that water damage of the system can be avoided.
Water mist cools the flame as well as produces steam to deplete the oxygen.
It could be used to replace Halon as well. Spray Cooling of Hot Metals S. C. Yao During heat treatment, water mist is used for effective cooling with controlled mass flux at desired locations. This is also used in hot steel mills for quenching of metals. Wide ranges of conditions are being investigated, covering drops from 100 micron up to 15 mm diameter, with various impaction velocities and mass fluxes. The study is directed towards well controlled heat treatment systems.