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Rheological Societies: Society's Site Sepember 2002 - Feb 2003, Appl. Rheol. 12 (2002) 214.H.A. Mang
The Fifth World Congress on Computational Mechanics
Appl. Rheol. 12:4 (2002) 204-206 ►
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Mang HA: The Fifth World Congress on Computational Mechanics, Appl. Rheol. 12 (2002) 204.Niall W.G. Young
Nordic Rheology Conference 2002
Appl. Rheol. 12:4 (2002) 202-203 ►
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Young NWG: Nordic Rheology Conference 2002, Appl. Rheol. 12 (2002) 202.
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Karttunen M, Vattulainen I, Lukkarinen A: SoftSimu 2002 -Novel Methods in Soft Matter Simulations, Appl. Rheol. 12 (2002) 200.
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Vermant J: Physical Hydrodynamics (E. Guyon, J.P. Hulin, L. Petit, C.D. Mitescu), Appl. Rheol. 12 (2002) 172.
The rheological behaviour of hydrated maize starch is investigated by means of a Haake internal mixer equipped with a sealed chamber. Results were obtained at temperatures between 89 and 115°C with water content between 25 and 30%. Through a proper calibration torque measurements and rotation speeds are converted to shear stress and shear rate data and this leads to the plot of a flow curve in the 10 - 1000 s-1 range. The data are compared with results of capillary rheometer and show that the mixer enables a reproducible plastification of the maize starch. The viscosity of the maize starch in the high shear rate range can be described by an apparent power law taking into account the moisture and temperature effects. On a larger range of shear rate, a Carreau law is preferred but the dependence on the temperature can only be described with shift factors that require a moisture dependent activation energy. Finally, this later discrepancy can be avoided by using a reference temperature to fulfil the iso-free volume condition by taking a constant temperature difference towards the glass transition of the samples. The glass transition is calculated by the Couschman and Karasz equation.► Cite this publication as follows:
Brouillet-Fourmann S, Carrot C, Mignard N, Prochazka F: On the Use of an Internal Mixer For the Rheological Characterizattion of Maize Starch, Appl. Rheol. 12 (2002) 192.
A numerical study is conducted on the behaviour of yield stress fluids in a mixing vessel equipped with anchor agitator in laminar regime. It is shown that extending a standard Carreau model of shear thinning fluid is a suitable practice. Validations versus Couette flow analytical solution are satisfactory. Main features of local hydrodynamics and global power consumption are described for a 2D flow. Significant changes in the flow pattern are observed for low inertia and high yield stress and the results are considered as guidelines for further laboratory experiments.► Cite this publication as follows:
Marouche M, Anne-Archard D, Boisson HC: A Numerical Model of Yield Stress Fluid Dynamics in a Mixing Vessel, Appl. Rheol. 12 (2002) 182.
The structural development undergoing during the cure of a latex polymer is accompanied by viscoelastic changes, so that this process can be investigated using a rheological approach. We present in this paper the results of a study carried out on one of the most widely used chemical binders in the field of textile nonwovens: acrylic latexes. The rheological measurements have been performed on the latex films in a rectangular torsion and dynamic oscillatory mode, and the observations are discussed in terms of crosslinking. The results obtained show that the zone where crosslinking occurs in the polymer can be clearly identified by the investigation method used.► Cite this publication as follows:
Lewandowski M, Rochery M, Bellayer S, Fourdrin S: Rheology of the Curing Process of Acrylic Latexes Used as Chemical Binders, Appl. Rheol. 12 (2002) 174.
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