Ignition and Combustion of Boron Particles and Clouds

TLDR: In this article, the authors defined the Steins an-Boltzmann constant as the product of the density-diffusivity product of boron and boric oxide.

Abstract: PE Nomenclature = heat capacity of the gases = boron heat capacity = oxide heat capacity = heat absorbed by reaction of B2O3 with H2O = heat absorption associated with surface reaction(s) (per unit mass of boron) = heat of vaporization of B2O3 = particle burning mass flux = heat release associated with gas-phase reaction(s) (per unit mass of oxygen) = heat release of B + B2O3 reaction = particle radius = molar rate of boron consumption = molar evaporation rate of boric oxide = molar rate of removal of B2O3 by water reaction = time = particle temperature = effective surroundings radiation temperature = particle surface temperature — ambient temperature = oxide layer thickness = ambient oxygen mass fraction = surroundings absorptivity = particle emissivity = boron density = boric oxide density = density-diffusivity product = Stef an-Boltzmann constant