Combustion of boron particles air suspension

Mathematical simulation was applied to evaluating the flame spreading and the flame front speed through the air suspension of boron particles as a function of pressure, excess oxidant ratio, and the particle size. Calculation accounts for a change in heat and mass transfer with a reduction of the particle size from micro-size to nano-scale. The model of flame front propagation through boron particle suspension in air (with account for molecular-kinetic mechanism of heat and mass transfer) allows estimating the normal speed of flame propagation as a function of initial size of boron particles, oxidant excess ratio, and pressure. The conditions were estimated and existence of extremes and flat zones on the curves was justified from a change in heat and mass transfer due to transition from the continuous medium flow to free-molecular flow regime.