非牛顿流体的稳定性及其流态判别

STABILITY OF NON-NEWTONIAN FLUID AND ITS FLOW PATTERN DISCRIMINATION

针对非牛顿流体的稳定性问题及其流态判别的研究 ,将整体稳定性理论及局部稳定性理论应用于塑性流体和幂律流体在同心环空的流动中 ,建立和推导出相对应的判别流动状态的稳定性参数表达式。这些参数的临界值与牛顿液体流态准数雷诺数的临界值 ,同样具有与液体流变性无关的特点。文章还系统地阐述了非牛顿流体各种稳定性参数的含义 ,并应用文献资料所提供的实验数据 。

In order to study the stability of non-Newtonian fluid and its flow pattern discrimination method,the integral stability theory and local stability theory are applied to the concentric annulus flowing of plastic fluid and power-law fluid,then a relevant stability parameter expression of discriminating flow pattern is derived and set up in the paper.The critical value of these parameters and that of flow pattern criterion Reynolds number of Newtonian fluid are equally possessed of the character irrelative to fluid rheological property.The meanings of various stability parameters of non-Newtonian fluid are systematically expounded and their accuracies and applicable scopes are stated in light of the experimental data collected from the documents.