NDLI: A New Criterion for Classification of Flows

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Thompson, Roney Leon Mendes, Paulo Roberto De Souza
Copyright Year	2003
Abstract	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 experiences 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 mark 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-different and is not restricted to particular classes of flows.
Sponsorship	Fluids Engineering Division
Starting Page	801
Ending Page	805
Page Count	5
File Format	PDF
ISBN	0791837165
DOI	10.1115/IMECE2003-43876
Volume Number	Fluids Engineering
Conference Proceedings	ASME 2003 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2003-11-15
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Deformation Flow (dynamics) Rotation Physics Stress Kinematics
Content Type	Text
Resource Type	Article

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