Applied Rheology: Publications

Appl Rheol online available publications for selected issue

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Delegates of the national rheological societies
Society's Site Mar 2008 - Aug 2008

Appl. Rheol. 18:1 (2008) 60-69

Cite this publication as follows:
Rheological Societies: Society's Site Mar 2008 - Aug 2008, Appl. Rheol. 18 (2008) 60.

Meta Skumavc
European Polymer Congress 2007

Appl. Rheol. 18:1 (2008) 51-52

Cite this publication as follows:
Skumavc M: European Polymer Congress 2007, Appl. Rheol. 18 (2008) 51.

Christophe Ancey
Visco-plastic fluids: from Theory to Application

Appl. Rheol. 18:1 (2008) 48-50

Cite this publication as follows:
Ancey C: Visco-plastic fluids: from Theory to Application, Appl. Rheol. 18 (2008) 48.

Aly Franck
A new generation of separate motor and transducer rheometers

Appl. Rheol. 18:1 (2008) 44-47

The new ARES-G2 is a rotational rheometer based on the unique concept of separation of motor and force/torque transducer. Designed from ground up, a key objective of the development project was to provide increased flexibility designing rheological experiments and to allow new and application specific test procedures. In order to achieve these goals all major instrument components such as the actuator, transducer, stage, data acquisition, environmental systems, etc. are developed as independent intelligent sub-assemblies, controlled by a central processor. The rigid firmware based on fixed test modes is replaced with a versatile user interface allowing a free combination of instrument instructions, which are downloaded to the instrument prior testing. Fast digital signal processing replaces the analog electronics providing faster, more accurate motor and transducer control and allowing the implementation of full stress control in oscillation and transient test modes. Significantly improved data acquisition with 5 fast data channels in all test modes enables SAOS and enhanced LAOS testing with complete support of higher harmonic analysis.

Cite this publication as follows:
Franck A: A new generation of separate motor and transducer rheometers, Appl. Rheol. 18 (2008) 44.

Sebastien Jarny, Nicolas Roussel, Robert Le Roy, Philippe Coussot
Thixotropic behavior of fresh cement pastes from inclined plane flow measurements

Appl. Rheol. 18:1 (2008) 14251 (8 pages)

We show that the rheological characteristics of a fresh cement paste can be determined from inclined plane tests.The apparent flow curve measured from inclined plane flows coincides with the apparent rheogram from classical rheometer tests and the flow curve obtained from local Couette flow measurements with magnetic resonance imaging (MRI). In order to describe the thixotropic properties of these fluids we suggest to use a simple model, the four parameters of which may be determined from specific, practical, inclined plane experiments.

Cite this publication as follows:
Jarny S, Roussel N, LeRoy R, Coussot P: Thixotropic behavior of fresh cement pastes from inclined plane flow measurements, Appl. Rheol. 18 (2008) 14251.

Jean-Christophe Baudez
Physical aging and thixotropy in sludge rheology

Appl. Rheol. 18:1 (2008) 13495 (8 pages)

a new technique of reconstruction of the velocity profile, the behaviour can be modelled by a unique equation including liquid and solid components but also a structural parameter. It is also rigorously demonstrated that the only one rheological behaviour in steady state in the liquid regime is a truncated power-law which can be defined only for a shear rate and a shear stress higher than a critical value. Moreover, the critical shear rate and shear stress increase with the solid content and depend on the fractal dimension of flocs which implies that thixotropic effects are all the more important as the sludge is thick and fresh.

Cite this publication as follows:
Baudez J-C: Physical aging and thixotropy in sludge rheology, Appl. Rheol. 18 (2008) 13495.

P.J. Martin, K.N. Odic, A.B. Russell
Rheology of commercial and model ice creams

Appl. Rheol. 18:1 (2008) 12913 (11 pages)

The rheologies of a shear-frozen commercial ice cream and of a model ice cream foam have been studied at - 5oC and other temperatures by capillary rheometry on a commercial manufacturing line and in a Multi-Pass Rheometer, respectively. Both were 50 vol% aerated emulsions of milk fat in an aqueous sucrose solution, but the model ice cream foam was without ice crystals. The data indicate significant wall slip effects which have been analysed using the classical Mooney method, the Jastrzebski variant and one based on Tikhonov regularization. The latter approach yields 'most convincing results', including a previously unreported region of shear thickening at very high shear rates of ~ 3000 s-1 for the model ice cream foam, when the capillary number indicates a possible transition in the flow around bubbles from domination by interfacial effects to viscous effects. Viscous heating effects were observed at relatively low shear rates for the commercial ice cream, but not the model ice cream foam. This was attributed to the melting of the ice crystal phase in the commercial ice cream, and, hence, absent from the model ice cream foam.

Cite this publication as follows:
Martin P, Odic K, Russell A: Rheology of commercial and model ice creams, Appl. Rheol. 18 (2008) 12913.

Vaclav Mik, Jiri Myska, Zdenek Chara, Petr Stern
Durability of a Drag Reducing Solution

Appl. Rheol. 18:1 (2008) 12421 (6 pages)

Effectiveness of drag reduction by small addition of a surfactant in the turbulent flow of water depends on the structure and concentration of the additive, temperature of the solution and turbulence intensity, possible flow disturbance by a mechanical obstacle and the content of ions in water, but also on the age of the surfactant solution.We show how important aging effects are in connection with total surfactant concentration, in particular how rheological parameters of the drag reducing solution change with time.

Cite this publication as follows:
Mik V, Myska J, Chara Z, Stern P: Durability of a Drag Reducing Solution, Appl. Rheol. 18 (2008) 12421.

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