Ignition and Incendivity of Laser Irradiated Single Micron-Size Magnesium Particles

A correlation function method of recovering the combustion law parameters for particles burning in optically thin dust flames

“…This agreement ensures the validity of the CF method itself and the validity of the function approximating an emitted radiation trace. Both methods result in slightly smaller values of k than those reported in the literature [19]. This discrepancy may be due to the relative motion of the particles with respect to the air, which affects the value of the combustion constant [25] through forced convection.…”

“…8 reveals that the CF method gives k = 0.51(±0.05) × 10 2 s/cm 2 (burning rate β ≡ 1/k = 1.94 × 10 −2 cm 2 /s), whereas the reference method gave k = 0.54(±0.06) × 10 2 s/cm 2 (β = 1.85 × 10 −2 cm 2 /s). Both β values lie above the upper limit of the previously reported values for single magnesium particles burning in quiescent air: 7.2 × 10 −3 cm 2 /s < β < 1.3 × 10 −2 cm 2 /s [19], 8.6 × 10 −3 cm 2 /s < β < 1.35 × 10 −2 cm 2 /s [20].…”

“…The second way is when the appropriate selection of moments, d Because the combustion constant for magnesium dust will be evaluated, some previous experimental results should be discussed. For a magnesium particle, it has been known that its combustion time depends on the initial size according to a d 2 0 -law (diffusion controlled combustion rate) [16,19,20]. This law has been reported for single particles burning in air with different temperatures and oxygen concentrations [16], for particles 40-200 µm in diameter [21], and also for aerosol combustion of 30-µm particles [5].…”

Thermally induced structural changes in coal combustion. Final report

“…Solomon et al 18 found that there are two distinct cross-linking events, occurring at different temperatures. At a heating rate of O.SC/s, the low temperature cross-linking occurs between about 200 and 450C, and the modercttc temperature cross-Un.king occw·s between 450 and 600C.…”

“…17 used a form of the electrodynamic balance to suspend metal panicles, which were ignited by a pulsed Nd-doped glass laser. Liebman et al 18 also used a quadrupole lcvitator to suspend magnesium particles for ignition by a Nd-doped glass laser. Bar .. Ziv 15 repons on some ignition studies in the electrodynamic thermogravimetric analyzer in his review article on single particle char combustion kinetics.…”