Evaluating shear rates for power law fluids in mixer viscometry
Evaluating shear rates for power law fluids in mixer viscometry
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评估混合器粘度计中幂律流体的剪切速率
DOI：
10.1111/j.1745-4603.1990.tb00493.x
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发表时间：
1990
影响因子：
3.2
通讯作者：
J. Steffe
中科院分区：
文献类型：
--
作者：
M. Castell;J. Steffe
建立混合器粘度法，粘度匹配和斜率的方法，进行了评估，以确定平均剪切速率时，搅拌时间无关，非牛顿流体。结果表明，混合器比例常数k '的恒定值的使用并不适用于流体流变特性、系统几何形状（叶轮和杯）和叶轮转速的所有范围。小的叶轮-杯直径比和大于0.33rev/s（20 rpm）的叶轮旋转速度提供用于评估k '的最佳操作参数。
Established mixer viscometry methods, the viscosity matching and the slope methods, were evaluated for determining average shear rates when agitating time-independent, non-Newtonian fluids. Results indicate that the use of a constant value of the mixer proportionally constant, k', is not valid for all ranges of fluid rheological properties, system geometry (impeller and cup) and impeller rotational speed. A small impeller-to-cup diameter ratio and impeller rotational speeds greater than .33 rev/s (20 rpm) provide the optimum operating parameters for evaluation of k'.