一种表征粉体流动性的新方法

New method of charactering powder flowability

粉体同时具有固体和流体的特征,粉体的"固-液"转变和表征粉体流动性成为粉体科学与工程中的一个热点和难点问题。根据低速转鼓中颗粒物质表面流动层剪切率γ的线性特征,提出将tγ=1/γ(即颗粒物质发生剪切变形的时间)作为表征粉体流动性的参数,并提出相应的测量和计算方法,其结果与采用霍尔流量仪测得的数据在特定条件下有良好的一致性。

Granular matter behaves both like solid and liquid, and the solid-liquid transition as well as characterization of granular flow ability has been an intense research subject in physics and engineering. According to the linear characteristic of the velocity grads of the granular surface flowing layer, it is proposed that the deformation time Tγ can be used to describe the flow ability of granular matter. This method is simplicity and relevance, and the results are in good agreement with the data getting from the hopper and repose angle tests.