幂律流体
表观粘度(apparent viscosity)或有效粘度(effective viscosity)则可表示为
幂律流体(英語:)是一类非牛顿流体,其剪应力τ可表示为
其中,
- K为稠度指数(flow consistency index)
- ∂u/∂y为剪切速率(shear rate)
- n为流动特性指数(flow behaviour index)
上述关系式又被称为奥斯特瓦尔德-德沃尔幂律关系(Ostwald–de Waele power law)。[1][2]
幂律流体可以根据流动特性指数n取值的不同而分为三类:
参考文献
- e.g. G. W. Scott Blair et al., J. Phys. Chem., (1939) 43 (7) 853–864. Also the de Waele-Ostwald law, e.g Markus Reiner et al., Kolloid Zeitschrift (1933) 65 (1) 44-62
- Ostwald called it the de Waele-Ostwald equation: Kolloid Zeitschrift (1929) 47 (2) 176-187
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