Numerical Simulation of Viscoplastic Fluid Flows Through an Axisymmetric Contraction

[+] Author and Article Information
Pascal Jay, Albert Magnin, Jean Michel Piau

Laboratoire de Rhéologie, BP 53, Domaine Universitaire, 38041 Grenoble Cedex 09, France

J. Fluids Eng 124(3), 700-705 (Aug 19, 2002) (6 pages) doi:10.1115/1.1486472 History: Received June 08, 2001; Revised March 20, 2002; Online August 19, 2002
Copyright © 2002 by ASME
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Comparison of numerical and experimental results
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Domain of the flow. Definition of R1, R2, L1, L2, α, H, and H1.
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Example of 3 meshes. Case of the 4:1 contraction ratio. (a) Contraction angle=20 deg 4247 nodes; (b) contraction angle=60 deg 5557 nodes; (c) contraction angle=90 deg 7123 nodes.
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Influence of Bi on the overall structure of the flow. Rigid static zone in black. Rigid moving zone hatched. n=1.
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Change in flow in relation to the Bi number. Zoom on the corner. n=1.
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Influence of contraction angle on flow structure for a 4:1 contraction ratio and Bi=10.n=1.
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Map showing the appearance of the vortex and rigid static zone. 4:1 contraction ratio. n=1.
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Influence of contraction ratio on flow structure. Bi=10.α=90 deg.n=1.
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Leq versus Bi number for different contraction angles. 4:1 contraction ratio. n=1. Newtonian limit for α=90 deg:Leq=0.55.
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Leq versus contraction angle for different Bi numbers. 4:1 contraction ratio. n=1.
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Leq versus contraction ratio for different Bi numbers. α=90 deg.n=1.




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