粘着力放物線法による粒子間摩擦係数と粘着力の製剤工学への応用(第2報)流出速度式のパラメーターに影響する諸因子

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In order to exemplify the usefulness of the cohesion parabola method, and to examine the adequacy of the slope in the flow rate equation as a measure of flow property of granules, stepwise regression analyses were carried out on the parameters in the Brown-Richard equation, using a FACOM 270-20/30 computer. [numerical formula] (n=0.4) The results showed that 82% of the variance of the slope M could be explained by the factors D_p/D_c, μ_i/k, and α, and that 82% of the variance of the width of empty annulus De could be explained by the factors D_L/S, and D_p ; where D_p is the particle size (the arithmetic mean opening of the successive sieves), D_c is the diameter of a vertical brass tube, μ_i is the coefficient of interparticle friction, k is the co-ordination number calculated from the porosity by the use of Ridgway-Tarbuck equation, α is the apparent coherency, D_L is the minimum orifice diameter which can possibly flow or slip on the wall, calculated on the basis of Gardner's theorem, and S is the shape factor (rugosity). Further, the following rule of thumb for prediction on the blocked aperture for noncohesive materials was proposed : "When the height of an apex of dynamic arch is higher than that of an imarginary pseudo-stable face, that is, the cohesion parabola face, the flow of granules commences and continues."
1972-06-25