确定磁流化床磁稳操作区域的理论分析与实验研究

The Analysis and Experiment of Determining the Stable Zone in a Magnetically Fluidized Bed

基于颗粒受力分析,运用流化床的基本理论,采用量纲分析法,提出磁流化床的磁稳区域主要取决于雷诺数Re、阿基米德数Ar和磁重势能比Er,并通过实验数据关联,进一步得出确定临界鼓泡流化速度与起始流化速度之比(即磁稳区域)的半经验公式.此公式与实验结果的误差小于8%,与以往文献中的数据基本吻合,这说明在一定场合下,该公式具有较好的适用性.

Basing on the analysis of the forces on magnetic particles, applying the basic theory of the fluidized bed and analyzing by the dimensionless method, the paper shows that the stable zone in a magnetically fluidized bed mainly depends on Re, Ar, and Er, which are primary factors to show the fludized characteristics of the magnetically fluidized bed. A relationship to express the ratio of minimun bubbling velocity to initial fluidized velocity is obtained through the processing of experimental data. Compared with the results reported before, the relationship proves to be correct on the condition of moderate intensity of the magnetic field, and the error of all experimental and calculated data is less than 8%.