Evaluation of Powder Rheology in a Gas-Solid Suspending System
Evaluation of Powder Rheology in a Gas-Solid Suspending System
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气固悬浮系统中粉末流变性的评估
DOI：
10.4164/sptj.44.4
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发表时间：
2007
影响因子：
--
通讯作者：
H. Usui
中科院分区：
文献类型：
--
作者：
K. Nakashima;Y. Komoda;Hiroshi Suzuki;H. Usui
颗粒处理工艺的设计需要粉末的流动特性。虽然存在各种指标，但大多数是从静态特性获得的，不能表达动态效果。在液体或气体的情况下，流动性的特性由粘度表示。特别是在液固悬浮的情况下，众所周知，粘度是由颗粒团聚的程度而变化的，悬浮颗粒的团聚是由“颗粒相互作用”决定的。然而，粉末层的特性还没有得到很好的理解。在这项研究中，一种方法来测量气-固悬浮液的粘度。用FT 4型粉末流变仪测量了叶片旋转下降形成粉末层时所受的扭矩。这些数据被用来计算粉末层的粘度。我们的结论是，众所周知的粉末流动性指数可以代表其动态特性，粉末粘度可以提供更详细的信息，粉末的流动性。
Design of particle handling processes requires the characteristics of powder on flowability. Although various indices exist, most were obtained from the static characteristics and cannot express the dynamic effect. In the case of liquid or gas, the characteristic of flowability is represented by viscosity. Especially in the case of liquid-solid suspension, it is well known that the viscosity changes by the degree of particle agglomeration, and the agglomeration of suspended particles is determined by “particle interaction”. However, the characteristics of powder layer have not been well understood. In this study, a method to measure the viscosity of a gas-solid suspension was developed. FT4 powder rheometer was used to measure the torque exerting on the blade, which rotated and descended into a powder layer. These data were used to calculate the viscosity of powder layer. We concluded that the well-known powder index for flowability may represent its dynamic characteristics and that the powder viscosity may provide more detailed information on powder flowability.