流态化
雷诺数
机械
牛顿流体
粘弹性
剪切减薄
流量(数学)
非牛顿流体
粒子(生态学)
粘度
斯托克斯流
材料科学
热力学
地质学
物理
流化床
湍流
复合材料
海洋学
作者
Ivan Machač,Petr Mikulášek,Iva Ulbrichová
标识
DOI:10.1016/0009-2509(93)80086-6
摘要
Fluidization of spherical-particle beds with viscoelastic shear thinning polymer solutions was experimentally investigated in creeping- and transient-flow regions. The results of measurements show that the course of bed expansion depends on the kind and degree of non-Newtonian anomaly, on the flow region, and on the apparatus wall effect. The limited bed expansion observed during fluidization in the creeping-flow region weakened with the increasing Reynolds number and vanished when a critical value of Reynolds number was exceeded. Empirical equations based on the Carreau viscosity model were suggested for the prediction of minimum fluidization velocity and for bed expansion in both creeping- and transient-flow regions.
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