Mixing of Solid Particles in a Cylindrical Tank Equipped with Paddle-Type Impellers
Mixing of Solid Particles in a Cylindrical Tank Equipped with Paddle-Type Impellers
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固体颗粒在配备桨式叶轮的圆柱形罐中的混合
DOI：
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发表时间：
1961
期刊：
影响因子：
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通讯作者：
S. Tone
中科院分区：
文献类型：
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作者：
T. Otake;H. Kitaoka;S. Tone
本文研究了两对具有相同粒度分布的干粉，即，砂-氯化钠（3242目）和碳酸钠-聚氯乙烯（100200目）。混合程度由Eq. (8)并确定了混合度与操作变量如叶轮尺寸、转速等之间的关系。(20)通过与扩散过程类比，从两种颗粒的浓度分布估算表观扩散系数。表观扩散系数与操作变量之间的关系通过方程得到。（二十二）、此外，混合的理论程度以表观扩散系数给出，如方程式10所示。（18）.将获得的表观扩散系数值引入方程（19）。(18)将理论混合度与实测混合度进行了比较，两者吻合较好，并得出结论：在桨式搅拌器混合固体颗粒时，扩散混合是相当明显的。
The mixing mechanisms of solid particles by paddle-type impellers were studied for two pairs of dry powders, having the same particle size distribution, viz., sand-sodium chloride (3242 mesh) and sodium carbonate-polyvinyl chloride (100200 mesh). The degree of mixing was defined anew by Eq. (8) and the relations between the degree of mixing and the operating variables, such as impeller size, rotational speed etc. were determined as given by Eqs. (20) and (21).By analogy with the process of diffusion, the apparent diffusivities from the concentration distribution of the two kinds of particles were evaluated. The relations between the apparent diffusivities and the operating variables were obtained by means of Eq. (22). Furthermore, the theoretical degree of mixing was given in terms of apparent diffusivities as in Eq. (18).Introducing the obtained values of apparent diffusivities into Eq. (18) and comparing the theoretical degree of mixing with observed one, the authors found good agreement between both the values and concluded that in the case of mixing solid particles by paddle-type impellers, the diffusive mixing was quite conspicuous.