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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Proceedings of the ASME Fluids Engineering Division; 20031115-20031121; Washington,DC; US >A NEW CRITERION FOR CLASSIFICATION OF FLOWS
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A NEW CRITERION FOR CLASSIFICATION OF FLOWS

机译：流动分类的新判据

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摘要

Astarita (1979) proposed a local and objective criterion to classify flows. His criterion is not restricted to MWCSH, and is essentially an attempt to quantify the stress-relieving rotation experienced by the flowing material. Huilgol (1980) analyzed Astarita's work and showed, through examples, some inconsistencies which rendered it useless as a general flow criterion. The present work revisits Huilgol's examples and discusses in detaile the underlying physics that make Astarita's criterion to fail for certain flows. This analysis leads to a new criterion for flow classification involving the concept of persistence of straining. A key kinematic entity introduced in the proposed criterion is the π-plane, a plane that is normal to the relative-rate-of-rotation vector. For a more comprehensive criterion, other parameters are needed in addition to a persistence-of-straining parameter. One of them is a measure of the deformation rate in the π-plane. Emphasis is given to isochoric motions. The proposed kinematic criterion is local, frame-indifferent and is not restricted to particular classes of flows.
机译：Astarita（1979）提出了一种局部和客观的标准来对流量进行分类。他的标准不限于MWCSH，本质上是试图量化流动材料所经历的应力消除旋转。 Huilgol（1980）分析了Astarita的工作，并通过实例显示了一些不一致之处，使它无法用作一般的流量标准。本工作回顾了Huiggol的示例，并详细讨论了使Astarita准则对于某些流动失败的潜在物理原理。该分析导致了涉及流变持久性概念的流分类新标准。提出的标准中引入的关键运动学实体是π平面，该平面垂直于相对旋转速率矢量。对于更全面的标准，除了持久性参数外还需要其他参数。其中之一是在π平面上变形率的度量。重点是等速运动。所提出的运动学准则是局部的，与帧无关的，并且不限于特定的流类别。

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