Combustion of boron particles air suspension
A.P. Shpara, D.A. Yagodnikov, A.V. Sukhov
Bauman State Technical University, Moscow, Russia
Keywords: air suspension, nanoparticles, boron, flame propagation
Abstract
Mathematical simulation was applied to flame spreading and the flame front speed through the air suspension of boron particles as a function of pressure, excess oxidant ration and the particle size. Simulation 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 analysis of 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 was justified due to a change in heat and mass transfer regime change in a continuous medium while transition to the free-molecular flow regime.
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