This paper presents a computational model that predicts the two-phase interaction between a water mist and a flame, including the fluid, thermal, and chemical effects associated with droplet evaporation and flame extinction. A central objective of the paper is to characterize the interaction of the water mist with thermal radiation, which may originate from hot post-flame gases or a hot solid object. The droplet cloud is a reasonably strong absorber of thermal radiation, especially in the wavelengths associated with water bands. The radiation can serve to preheat and pre-evaporate the droplets upstream of the flame itself, altering the structure and extinction of the flame. The mist also acts as a radiation shield that attenuates radiation through its thickness. Interaction of radiation with the mist and the flame is characterized in terms of droplet size and number density. The spectrally dependent emission of gas-phase radiation is modeled using an exponential wide-band model. The radiation-droplet interaction is modeled using Mie-scattering theory, wherein the absorption behavior of the water mist is incorporated considering the spectral complex refractive index for liquid water.
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