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  • 1
    Electronic Resource
    Electronic Resource
    Einfluß der Dissipation bei der Kapillarviskosimetrie nicht-newtonscher Flüssigkeiten (1978)
    Springer
    Rheologica acta 17 (1978), S. 383-386 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Summary The results of a theoretical analysis on pressure drop in a pipe with constant wall temperature, taking into account effects of dissipation, and of temperaturedependent non-Newtonian viscosity, are presented. A simple critical equation answers whether these effects are negligible, and enables to evaluate a viscosity from capillary viscometry data even in the case when the dissipation is important.
    Notes: Zusammenfassung In dieser Untersuchung werden die Ergebnisse der theoretischen Lösung des Problems der Strömung einer Flüssigkeit mit temperaturabhängiger nichtnewtonscher Viskosität durch ein Rohr mit kreisförmigem Querschnitt unter laminaren Strömungsbedingungen und bei sich bemerkbar machender Dissipation zusammengestellt. Die Resultate werden derart bearbeitet, daß sie die Abschätzung des Einflusses der Dissipation bei Daten ermöglichen, die mit einem Kapillarviskosimeter gewonnen werden. Gleichzeitig wird angegeben, wie dieser Einfluß zumindest teilweise bei den Berechnungen der Parameter einer dem Potenzgesetz gehorchenden nicht-newtonschen Flüssigkeit eliminiert werden kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01525953
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  • 2
    Electronic Resource
    Electronic Resource
    Calibration of electrodiffusion friction probes using a voltage-step transient (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 329-335 
    Details
    ISSN: 1572-8838
    Keywords: friction probes ; electrodiffusion ; shear rates ; calibration ; transients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Voltage-step transient experiments are used to calibrate electrodiffusion (ED) friction probes. The approach is demonstrated on the probes in high-speed rotating impellers. This calibration has shown that shear rates as high as 106s-1 can be measured reliably using 0.5mm Pt working electrodes in ferro/ferricyanide aqueous solutions. The complete transient calibration experiment provides sufficient information about the dynamics of ED friction probes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003224018571
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  • 3
    Electronic Resource
    Electronic Resource
    Electrodiffusional flow diagnostics in a centrifugal pump (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 337-342 
    Details
    ISSN: 1572-8838
    Keywords: electrodiffusion ; flow measurements ; centrifugal pump ; shear rate ; soft processing ; open impeller
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper presents electrodiffusional measurements of the wall shear rate at the impeller surface of a radial centrifugal pump. Twelve probes of different radii and at different positions along one blade were used in a pump with an open six bladed impeller. By means of throttling and speed control the operating point of the pump was adjusted and the influence on the wall shear rate was studied. The measurements were related to the analytical solution for a free rotating disc and the shear gradients were in the same order of magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003276002641
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  • 4
    Electronic Resource
    Electronic Resource
    Newtonian flow through a helical duct of a screw agitator Part II: The numerical solution (1973)
    Springer
    Acta mechanica 18 (1973), S. 181-192 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Zur Analyse der schleichenden Strömung einer Newtonschen Flüssigkeit durch den schraubenförmigen Kanal eines in einem Leitrohr rotierenden Schneckenrührers wird die Methode der endlichen Differenzen angewendet. Ergebnis dieser Rechnungen sind Felder der Stromfunktion, des Wirbelvektors, der Geschwindigkeitskomponente und des Drucks im Kanal, wie auch der Volumendurchfluß der Flüssigkeit durch den Kanal.
    Notes: Summary The finite-difference technique is used for analysis of Newtonian creeping flow through a helical rectangular duct of a helical screw agitator rotating in a draught tube. The results of the analysis are the fields of the stream function, vorticity, velocity components and pressure in the duct as well as the volumetric flow rate through the duct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178553
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  • 5
    Electronic Resource
    Electronic Resource
    Newtonian flow through a helical duct of a screw agitator part I: The mathematical model (1973)
    Springer
    Acta mechanica 18 (1973), S. 71-79 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die schleichende isotherme Strömung einer Newtonschen Flüssigkeit im Leitrohr einer Mischvorrichtung mit einem Schneckenrührer wird durch die zweidimensionale Strömung durch einen schraubenförmigen rechtwinkligen Kanal modelliert. Die Kontinuitäts- wie auch die Bewegungsgleichungen werden in einem nicht-orthogonalen Schrauben-Koordinatensystem ausgedrückt, was die implizite Einschließung der geometrischen Anordnung des schraubenförmigen rechtwinkligen Kanals in diese Gleichungen ermöglicht und zu einfachen Ausdrücken für die kinematischen Rand-bedingungen an den Kanalwänden führt. Mit Hilfe der Stromfunktion und der Komponente des Wirbelvektors werden die zweidimensionalen Transportgleichungen weiter vereinfacht. Zu deren numerischer Lösung wird die Methode der endlichen Differenzen vorgeschlagen.
    Notes: Summary The isothermal creeping flow of a Newtonian fluid through a draught tube with the rotating helical screw agitator in a mixing equipment is modelled by means of a two-dimensional flow through a helical rectangular duct. In order to incorporate the geometrical arrangement of the flow system as well as the kinematical boundary conditions at the solid walls into the mathematical formulation of the problem most easily, the equations of continuity and motion are expressed in a system of non-orthogonal helical coordinates. Introducing the stream function and component of the vorticity vector the transport equations are further simplified. The finite-difference method is proposed for the solution of the resulting system of equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01173458
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  • 6
    Electronic Resource
    Electronic Resource
    Newtonian flow through a helical duct of a screw agitator part III. Experimental investigation and comparison with computation (1974)
    Springer
    Acta mechanica 19 (1974), S. 15-21 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Experimentell ermittelte Durchflußmengen einer Newtonschen Flüssigkeit durch ein Leitrohr mit rotierendem Schneckenrührer werden verglichen mit den theoretisch berechneten Werten, die sich aus dem mathematischen Modell der schleichenden Strömung durch einen schraubenfömigen rechtwinkligen Kanal ergeben. Aus dem Vergleich der experimentellen und der theoretischen Werte geht hervor, daß es durch Lösung des mathematischen Modells möglich ist, den Einfluß der geometrischen Parameter des Schneckenrührers auf die Strömung der Flüssigkeit im System “Rührer—Leitrohr” zu erfassen.
    Notes: Summary Experimentally obtained flow rates of a Newtonian fluid through a draught tube with a helical screw agitator are compared with theoretical predictions resulting from the mathematical model of creeping flow in a helical rectangular duct. Comparison of the experimental and theoretical results brings out that the solution of the mathematical model forms an adequate basis for determining the influence of the geometrical parameters of the agitator on the flow in the agitator-draught tube assembly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176267
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  • 7
    Electronic Resource
    Electronic Resource
    Surface shapes of fluids in rotating vessels (1970)
    Springer
    Flow, turbulence and combustion 22 (1970), S. 150-158 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The shape of the phase boundary of two fluids in systems with a rotational symmetry, and particularly the level of the liquid in a rotating vessel, is studied. The knowledge of the shape of the surface of such a liquid is necessary for centrifugal moulding of optical surfaces. The dimensionless surface equations are formulated, and the solutions of these equations, taking into account the boundary conditions, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400523
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  • 8
    Electronic Resource
    Electronic Resource
    Poiseuillesche Strömung thixotroper Substanzen bei Schwingung (1976)
    Springer
    Colloid & polymer science 254 (1976), S. 927-927 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01775424
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  • 9
    Electronic Resource
    Electronic Resource
    Couette-Strömung thixotroper Substanzen bei Schwingung (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 283-283 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550563
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  • 10
    Electronic Resource
    Electronic Resource
    Non-Newtonian flow in annuli (1970)
    Springer
    Rheologica acta 9 (1970), S. 278-282 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Summary An analysis of mathematical model describing the steady-state, laminar, isothermal, axial flow in ducts of annular cross-section is presented which permits a solution to be formulated which holds for any model of incompressible purely-viscous fluid (generalized Newtonian fluid).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01973488
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