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  • 1
    Electronic Resource
    Electronic Resource
    Three-dimensional study of extrusion processes by Boundary Element Method. (1988)
    Springer
    Rheologica acta 27 (1988), S. 639-648 
    Details
    ISSN: 1435-1528
    Keywords: Boundary Element Method ; three-dimensionalextrusion ; complexviscoelastic flow ; axisymmetric-equivalentswell ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract This paper describes an implementation of a Boundary Element method to solve a general three-dimensional viscoelastic flow problem. The Boundary Element method is formulated in terms of unknown boundary velocity and traction fields. The fluid is incompressible and is modelled by a differential constitutive equation. The steady-state stress field is obtained by a “time marching” process of integration. For the first time, some results for steady state isothermal creeping flow extrusion of a viscoelastic fluid from triangular and square dies are described. The concept of an “axisymmetric-equivalent swell ratio” is introduced to compare the present results with the results of axisymmetric extrusion studies reported in the literature. It is shown that reasonable agreement is achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01337460
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Squeezing of an Oldroyd-B fluid from a tube: Limiting Weissenberg number (1985)
    Springer
    Rheologica acta 24 (1985), S. 15-21 
    Details
    ISSN: 1435-1528
    Keywords: Squeezing flow ; Oldroyd-B fluid ; similarity solution ; critical Weissenberg number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract It is shown that the squeezing flow of an Oldroyd-B fluid from a tube with a prescribed time-dependent radius has an exact separable solution. In the special case where the tube radius varies exponentially with time a similarity solution exists. However, in this case there is a critical Weissenberg number above which a component of the stress tensor increases without bound in time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01329258
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Squeezing a viscoelastic fluid from a cone (1985)
    Springer
    Rheologica acta 24 (1985), S. 119-126 
    Details
    ISSN: 1435-1528
    Keywords: Squeezing flow ; cone ; limiting Weissenberg number ; Oldroyd-B fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The paper reports an exact kinematics for the squeezing flow from a cone of a general viscoelastic fluid. To obtain numerical values for the stresses, a network model that allows stress overshoot and shear-thinning in the start-up of a shear flow is adopted. Both these features are important in this flow. For the special case of an Oldroyd-B fluid it is shown that there is a limiting Weissenberg number above which at least one component of the stresses increases unboundedly with time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333238
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Three-dimensional study of extrusion processes by Boundary Element Method. (1988)
    Springer
    Rheologica acta 27 (1988), S. 21-30 
    Details
    ISSN: 1435-1528
    Keywords: Boundary Element Method ; three-dimensionalextrusion ; complexviscous flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In this paper we report an implementation of a Boundary Element Method (BEM) dealing with three-dimensional extrusion problems of viscous fluid. Die shapes with and without sharp corners and their influence on the final shape of extrudate have been studied: both shrinkage and swelling of the extrudates relative to the original die shapes have been discovered. The first half of this paper deals with the problem of implementing isoparametric boundary elements. It is followed by results of test problems, and finally the results of extrusion study are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372446
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    Paper (German National Licenses)
    Fulltext
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