Author(s)

T. Sikanen, J. Vaari & S. Hostikka

Abstract

Water mists systems are used to protect people and property from fires. They suppress fires by three main mechanisms: removal of heat from the gases, displacement of oxygen by water vapour and attenuation of radiation by droplets. Correct prediction of these mechanisms hinges on accurate modeling of droplet transport. This paper discusses the modeling and simulation of high speed water mist systems using Large Eddy Simulation and a Lagrangian description of the spray. The focus is on the droplet transport. Particular attention is given to the droplet injection model and sub models for coupling of the dispersed and continuous phases. Effects of turbulence modeling on droplet transport is explored. The modeling results are compared to experimental data from both small and large scale experiments. Keywords: water mist, interphase momentum transfer, turbulence modeling, large eddy simulation, lagrangian-eulerian,large scale.

Keywords

Keywords: water mist, interphase momentum transfer, turbulence modeling, large eddy simulation, lagrangian-eulerian,large scale.