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  • 1975-1979  (3)
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 253 (1975), S. 618-619 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In mechanics, thixotropy is another typical example. It describes materials whose resistance to flow is lowered when subjected to mechanical agitation. In such a system the shear stress, T, will normally not be in phase with a shear rate, y, that is varied periodically. Hence a i-y plot will show a ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 224-232 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An efficient and simple numerical technique is presented for analyzing nonisothermal nip flow of viscous liquids. It has been applied on calendering to calculate the design parameters as well as the interaction effects between roller characteristics, operation conditions, and material properties. Viscous heating is shown to drastically change the mechanics near the nip exit if the rollers rotate at different speeds. Consequences for scaling-up and model experiments are indicated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Rheologica acta 14 (1975), S. 721-728 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Es wurde das lineare und nicht-lineare Verhalten thixotroper Dispersionen in viskoelastischen Medien experimentell untersucht. Die Systeme bestehen aus Rutil(TiO2)-Teilchen, die in einer 85%igen Lösung von polymerisiertem Leinöl in (monomerem) Leinöl dispergiert sind. Die Volumenkonzentration der dispersen Phase variiert von null bis 23.8%. Bei stationären Fließbedingungen wurden die Gleichgewichts-Viskosität und die erste Normalspannungsdifferenz aufgenommen. Die Viskositätswerte erstrecken sich vomnewtonschen bis zum Potenz-Gesetz-Bereich. Es wurden relative Eigenschaften berechnet, die entweder auf gleiche Schergeschwindigkeiten oder gleiche Schubspannungen bezogen sind. Die Ergebnisse werden im Hinblick auf hydrodynamische und physikochemische Wechselwirkungen diskutiert und mit den vorliegenden Daten anderer viskoelastischer Suspensionen verglichen. Der Beitrag der Thixotropie wird abgetrennt und seine viskoelastische Natur aufgezeigt. An den gescherten Proben werden Schwingungsmessungen durchgeführt, und ihre Ergebnisse werden mit dem Verhalten bei stationären Bedingungen sowohl im linearen als auch im nichtlinearen Konzentrationsbereich verglichen.
    Notes: Summary The linear and nonlinear behaviour of thixotropic dispersions in viscoelastic media has been measured. The systems are composed of rutile TiO2 particles dispersed in a 85% solution of polymerized linseed oil in linseed oil. The volume concentration of the dispersed phase varies between 0 and 23.8%. Under stationary flow the equilibrium viscosities and the first normal stress differences have been recorded. The viscosity data extend from theNewtonian to the power law region. Relative properties have been calculated based upon equal shear rates and also based upon equal shear stresses. The results are discussed in the light of hydrodynamic and physicochemical interactions. A comparison is made with available data on viscoelastic suspensions. The contribution of thixotropy is isolated and its viscoelastic nature is demonstrated. Oscillatory measurements are performed on the sheared samples and the results are compared with the behaviour under stationary flow in the linear as well as in the nonlinear concentration range.
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