新型脈動気流式粉体混合器の概念設計

拡散, 剪断付加混合機構

抄録

The mixing simulation of a binary powder mixture was carried out in order to design a new type of continuous powder mixer by applying fluctuating air. Shearing and diffusive mixing effects were added to our convective mixing mechanism proposed before by introducing coefficients of particle exchange and diffusion, respectively.
The mixing degree of the mixed layer was calculated according to those mixing coefficients, the operating conditions, and the dimensions of the mixer. It was found that the mixing degree increases with the horizontal transporting distance and the residence time of the particles descending in the mixer. As a result, the mixing mechanism of the designed mixer was described analytically, and proper conditions could be chosen to control the mixing degree.