乱流気流中における微粒子の凝集過程の測定と数値計算結果との比較

概要

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Turbulence causes collisions between neighboring particles due to random motion, resulting in coagulation of particles. In this study, we measured size distributions of the suspended aerosol particles in a stirred tank using a scanning electron microscope. We also calculated the process of turbulent coagulation using a population balance equation with three different collision rate equations. Of these, Saffman and Turner's collision rate equation [Saffman, P. G. and J. S. Turner, J. Fluid Mech., 1 (1956), 16. ] neglects particle inertia while Abrahamson's one [Abrahamson, J., Chem. Eng. Sci., 30 (1975), 1371. ] neglects correlation between two collision particles. In contrast to them, Yuu's collision rate equation [Yuu, S., AIChE J., 30 (1984), 802. ] takes both effects into account and the calculated size distribution based on it was found to be in good agreement with the experimental results. It is concluded that the particle inertia and the correlation between two collision particles play important roles in turbulent coagulation.
一般社団法人日本機械学会の論文
1995-10-25