Journal of Civil and Environmental Engineering

The Effect of Water Mist Droplet Size and Nozzle Flow Rate on Fire Extinction in Hanger by Using FDS

Abstract

Mohamed Fayek Abdrabbo, Ayoub Mostafa Ayoub, Mohamed Aly Ibrahim and Abdelsalam M. Shara Feldin

Water is playing a vital role and widely used in our life. The use of water for fire extinction and extinguishment is widespread because of the following reasons. The first is economic. A second reason is that many fire safety. Fire suppression by using water mist is widely considered to be an alternative to gaseous fire suppression agents. A lot of commercial activity has occurred in the last years to develop technology for fire suppression systems based on water mist. The objective of this paper is to investigate the effectiveness of water mist with various droplet sizes and various nozzle flow rate on fire suppression in hanger, taking into account extinguishing time, gas concentration, and temperature decay. Three nozzle flow rate with the same conditions were employed and different droplet size provided. It was found that the extinguishing time decreases with the droplet size decrease and flow rate increase. The temperature decay rate was improved by decreasing the droplet diameter or increasing the flow rate. In addition, with an increase in the extinguishing time, the concentration of O2 decreased while CO2 increased. The study is carried out using Fire dynamic simulator (FDS) combined with PYROSIM and SMOKEVIEW programs. These programs, to achieve the model of compartment fire scenario require investigating and determining temperature and gas concentration.