Modeling the discharge of a powder fire extinguisher by mixed discrete element method and computational fluid dynamics
A model that combines the discrete element method (DEM) and computational fluid dynamics (CFD) was developed for investigating the discharge of a powder fire extinguisher. The mathematical model is based on the equations of k-ε turbulent models coupled with the equations of particle motion. The discrete element method is used for obtaining the contact forces and the movement of individual particles. The contact force is calculated from the concept of friction slider and the flow field of gas is predicted by the Navier-Stokes equation. This DEM-CFD model provides the information needed to evaluate fire extinguisher performance.
Keywords: fire extinguisher, discrete element method (DEM), computational fluid dynamics (CFD), fluid-particles interactions