Spectral radiation characteristics of water sprays

Abstract

In this paper an analysis is presented to predict the spectral absorption, extinction and scattering coefficients of water sprays using Mie theory for spherical, homogeneous particles. The spectral absorption and extinction efficiencies are calculated for different mean droplet diameters and different droplet size distributions. To generalize the results and account for the spectral dependence of the optical constants of water, the efficiency factor for extinction in the small particle size limit of the Mie theory is used for scaling. The results of calculations for different size water droplet spray distributions are discussed. The results reported can be used in radiative transfer submodels of computational fluid dynamics simulation of fire suppression using water sprays/mists.