ノズル近傍のガス流速分布がアトマイズ粉末粒度分布に及ぼす影響

概要

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The relationship between atomized median particle size and atomizing conditions was discussed. Median particle size was proportional to one-seconds power of gas and metal flow rate ratio. An experimental equation was obtained as follows; dp/Dl=63.6⋅((M1/Mg)⋅(σ1/(D1⋅ρ1⋅Vm2))⋅(ν1/νg))0.5 where dp is the mean particle size, Dl is diameter of melt delivefy tube, M1 is mass flow rate of melt, Mg is mass flow rate of gas, Vm is average gas velocity in near nozzle region, σ1 is the surface tension of melt, ρ1 is the density of melt, ν1 is kinetic viscosity of melt, νg is kinetic viscosity of gas and k1 is a constant. Effect of gas velocity distributions in near nozzle region on particle size distributions was discussed. Gas velocity distributions were calculated by solving the full Reynolds-averaged Navier-Stokes equations. The calculated gas velocity distributions roughly coincided with the experimental results. Particle size distributions were calculated by using gas velocity distributions and our experimental equation for mean particle size. The calculated particle size distributions also coincided roughly with the experimental results. It was shown that the particle size distribution depends on the gas velocity distributions in near nozzle region.
社団法人粉体粉末冶金協会の論文
2001-11-15