電気抵抗差のある2成分粒子系の混合モデル(<小特集>粉体小特集)

概要

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Simulation for a mixing model of binary system of spherical particles with different electric resistance,such as lead and stainless,was carried out in a stationary mixer with vertical impeller blades. The simulation model described above was compared with the actual experiment. In the actual experiment,the total electric resistance of the system,R was measured by a DC-tester, and the top and bottom view of the bed were observed. The mixing model in the previous paper based on the assumption that the particles were moved in square orbits,was modified to fit to the actual process. The modification was mode by taking into account the contour of orbits,and by introducing the circulating velocity of particles (the following coefficient),phase and frequency in the equation of R. The contour of orbit seemed to be semicircle according to the photographs. The actual value of the following coefficient (the ratio of the domain of rotational movement of particles to that of each orbit)was obtained from the photograph. By considering the fact described above,the following modified equation was proposed. R=l・exp(-k_1・t)・Σa_l・sin2(w_l・t-π/4)+m-n・exp(-k_2・t) Where,R : Total electric resistance l, k_1, a_l, m, n, k_2:Constans w_l:Augular velocity : Following coefficients t:Time The proposed equation showed good agreement with experimental data.
社団法人日本材料学会の論文
1986-11-15