关于二相流、多相流、多流体模型和非牛顿流等概念的探讨

本文分析了单相流、二相流和多相流等概念上的差异，也分析了单流体模型、双流体模型和多流体模型等概念上的差异，指出前面三种概念是按流动介质的客观物理构成划分的，而后者是按主观采用的研究方法划分的．目前这些概念在使用中存在一些混乱，如二相流与多相流，多相流与多流体模型等．本文还研究了扩散模型、非牛顿流模型和颗粒流模型等，指出前两种模型在分类上属于单流体模型，分析了非牛顿流模型、扩散模型和双（多）流体模型的特点和应用范围，最后，以泥石流为例讨论了以上概念的应用．

Discussion on the Concepts of Two-Phase Flow,Multiphase Flow,Multifluid Model and Non-Newtonian Flow

The differences between the concepts of single-,two-and multi-phaseflow and the differences between the concepts of single-, two-and multi-fluidmodel have been studied in this paper.The first three concepts are defined ac-cording to the physical properties of the moving medium,while the second threeare based on the research methods used by authors. Now, there are some con-fusions in using these concepts,such as two-phase flow and multiphase flow,multiphase flow and multifluid model,and so on.The diffusion model, non-Newtonian flow model and granular flow model are also studied in this paper,and it is indicated that the first two models belong to the single-fluid model inclassification.Taking debris flow as an example,the characteristics and suitableareas of applications of the non-Newtoniair-flow model,diffusion model andtwo-(or multi-)fluid model are also discussed.