- Author
- Atreya, A.
- Title
- Extinguishment of Combustible Porous Solids by Water Droplets. Annual Progress Report.
- Coporate
- Michigan State Univ., East Lansing
- Sponsor
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
- Annual Progress Report, September 1990, 11 p.
- Contract
- NIST-GRANT-60NANB8D0861
- Keywords
- porous solids | extinguishment | combustibles | droplets | water | pilot ignition | cooling | combustible solids
- Abstract
- The objective of this work is to extend the previous research on piloted ignition and cooling of inert isothermal porous ceramic solids by water droplet evaporation to real combustible materials. This new phase of the project was started and previous work on piloted ignition was completed during the present grant year. A novel apparatus, based on the previous work of Dr. David D. Evans, has been developed to study the extinguishment of combustible solids. This apparatus along with the cone heater is being used to quantify the fire suppression rate as measured by the decrease in the energy release rate due to water droplet application and to determine the fire suppression boundary and the eventual time to extinguishment. On the theoretical side, a simplified model for piloted ignition obtained from first principles has been developed and tested (This was a part of the previous phase of this study which has recently been completed. The Ph.D. thesis of Dr. Lin-Shyang Tzeng describing this work is presented in Appendix A). Also, the existing heat release rate models for porous charring materials are being extended to incorporate the effect of droplet evaporative cooling. This work will be useful for the development of fire suppression models.