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  • 1
    Electronic Resource
    Electronic Resource
    Partial Wall Slip in Polymer Flow (1994)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 33 (1994), S. 2434-2436 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00034a027
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  • 2
    Electronic Resource
    Electronic Resource
    Initial Profile Development in Melt Spinning (1980)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 19 (1980), S. 195-197 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160074a011
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  • 3
    Electronic Resource
    Electronic Resource
    Note on the Rayleigh problem for a visco-elastic fluid (1962)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 13 (1962), S. 573-580 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Zusammenfassung Der Mangel an nichtstationären Lösungen für viskoelastische Strömungen hat den Autor veranlasst, das (aufRayleigh zurückgehende) Problem der plötzlich beschleunigten Platte für eine spezielle, vonOldroyd beschriebene viskoelastische Flüssigkeit zu untersuchen. Es wird eine lineare partielle Differentialgleichung erhalten, die, teilweise durch numerische Integretion, für den Bereich 0...1 der Variablen λ2/λ1 gelöst wird (λ2: Retardationszeit, λ1: Relaxationszeit). Einige Beispiele werden graphisch ausgewertet, und es wird das asymptotische Verhalten angegeben. Zwischen den Fällen λ2/λ1=1 (Diffusionsgleichung) und λ2/λ1=0 (gedämpfte Wellen) besteht ein kontinuierlicher Übergang. An einer gegebenen Stelle nimmt die Geschwindigkeit anfänglich langsamer und später rascher zu als im viskosen Fall. Dies lässt sich durch Speicherung und Abgabe von elastischer Energie erklären.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01595580
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  • 4
    Electronic Resource
    Electronic Resource
    Numerical investigations of Lagrangian unsteady extensional flows of viscoelastic fluids in 3-D rectangular ducts with sudden contractions (1998)
    Springer
    Rheologica acta 37 (1998), S. 158-169 
    Details
    ISSN: 1435-1528
    Keywords: Key words Contraction flows ; extension behaviour ; finite volume method ; secondary flows ; constitutive models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A numerical study focusing on the macroscopic flow patterns and the Lagrangian unsteady extensional flow behaviour of a viscoelastic fluid in a rectangular duct with a sudden contraction is carried out using a three-dimensional (3-D) finite volume method (FVM). The flow geometry consists of an upstream duct with a square cross-section and a smaller downstream duct with a square or a rectangular cross-section, which corresponds to the so-called „square/square” (Sq/Sq) contraction and the planar contraction, respectively. The Phan-Thien Tanner (PTT) model, including the upper convected Maxwell (UCM) model as a special case, is adopted for the viscoelastic fluid description. Different vortex features observed experimentally in the two different types of contraction flows for the same fluid are predicted. It is found numerically that the macroscopic flow features are well correlated to the fluid‘s Lagrangian unsteady extensional behaviour in the Sq/Sq (or similarly in the axi-symmetric) contraction flow. In the planar contraction flow, however, the predicted Lagrangian unsteady extensional behaviour is different from its steady-state case, and no direct correlation can be made. The large transient extensional stress and the bounded transient extensional viscosity in the planar contraction flow may be responsible for the differences in the vortex patterns in the two contraction flows of viscoelastic fluid with a constant viscosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003970050102
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  • 5
    Electronic Resource
    Electronic Resource
    Langevin analysis of dumbbells with hydrodynamic interaction (1978)
    Springer
    Rheologica acta 17 (1978), S. 568-577 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung In dieser Veröffentlichung wird das Problem der hydrodynamischen Wechselwirkung in der kinetischen Theorie der Hanteln mit der traditionellen Langevin-Analyse behandelt. Bei dieser Methode wird die Vorab-Mittelung des Oseen-Tensors vermieden. Es wird gezeigt, daß das Verhalten der Hanteln von demjenigen qualitativ verschieden ist, das durch das Modell des vorab gemittelten Oseen-Tensors vorausgesagt wird. Das wichtigste Ergebnis ist, daß die so bestimmte nicht-newtonische Viskosität für die stationäre Scherströmung jetzt größenordnungsmäßig mit der experimentell beobachteten übereinstimmt, im Gegensatz zu der bei der Vorab-Mittelung erhaltenen konstanten Viskosität.
    Notes: Summary In this communication we consider the hydrodynamic interaction problem in dumbbell kinetic theory using the traditional Langevin analysis. The pre-averaged Oseen tensor is avoided in the formulation. It is shown that the behaviour of the dumbbell is qualitatively different from that predicted by models employing the pre-averaged Oseen tensor; the most important result is that the predicted non-Newtonian viscosity in a steady shearing flow now occurs at the experimentally observed order of magnitude of shear rate. This contrasts with the constant viscosity predicted by the pre-averaged calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01522029
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  • 6
    Electronic Resource
    Electronic Resource
    A test particle approach to flow classification for viscoelastic fluids (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 910-918 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The formulation of the Deborah and Weissenberg dimensionless numbers for viscoelastic fluids by means of a scheme based on the response of hypothetical tracer test particles having the form of elastic dumbbells is presented. By considering the dynamics of these test particles, we can classify flows as being either strong or weak. Consideration of the amount of stretching of a swarm of dumbbells in one relaxation time also provides a definition of the Weissenberg number. A simple workable definition of the Deborah number is given, and, finally, the ideas are applied to a viscoelastic lubrication case, to an inlet flow, and to the flow through porous media.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220515
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  • 7
    Electronic Resource
    Electronic Resource
    Wirecoating die design using finite element methods (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 416-421 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The design of wire-coating dies is described using finite element numerical analysis as a guide. Finite elements are able to accommodate awkward geometries and non-Newtonian fluid properties in a realistic manner, and produce streamline and stress patterns within the die. Two basic die geometries are examined and a new design which eliminates recirculation within the die is proposed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180514
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  • 8
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    Review Article: Aspects of non-colloidal suspension rheology (2018)
    American Institute of Physics
    Details
    Publication Date: 2018-10-01
    Print ISSN: 1070-6631
    Electronic ISSN: 1089-7666
    Topics: Physics
    Published by American Institute of Physics
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  • 9
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    Shear Thinning of Noncolloidal Suspensions (2016)
    American Physical Society
    Details
    Publication Date: 2016-08-31
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 10
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    Partial Wall Slip in Polymer Flow (1994)
    American Chemical Society
    Details
    Publication Date: 1994-10-01
    Print ISSN: 0888-5885
    Electronic ISSN: 1520-5045
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society
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