Applied Rheology: Publications

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Vojtech Bares, Zdenek Chara, Yasushi Takeda
6th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering (6 ISUD)

Appl. Rheol. 19:1 (2009) 46-47

Cite this publication as follows:
Bares V, Chara Z, Takeda Y: 6th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering (6 ISUD), Appl. Rheol. 19 (2009) 46.

Leslie Y. Yeo, Ravi Prakash-Jagadeeshan, James R. Friend
Complex Fluids and Microfluidics Workshop 2008 (CFMW08)

Appl. Rheol. 19:1 (2009) 44-46

Cite this publication as follows:
Yeo LY, Prakash-Jagadeeshan R, Friend JR: Complex Fluids and Microfluidics Workshop 2008 (CFMW08), Appl. Rheol. 19 (2009) 44.

Jan Mewis
Short course on Suspension Rheology JCR

Appl. Rheol. 19:1 (2009) 43-43

Cite this publication as follows:
Mewis J: Short course on Suspension Rheology JCR, Appl. Rheol. 19 (2009) 43.

A. Kaci, M. Chaouche, P.-A. Andreani, H. Brossas
Rheological behaviour of render mortars

Appl. Rheol. 19:1 (2009) 13794 (8 pages)

Steady state and transient rheological behaviours of a one-coat render mortar are considered experimentally using a shear rheometer equipped with the vane geometry.The flow curves performed at controlled shear-rates exhibit highly pronounced minima, which is attributed to shear localization and strong thixotropy. This latter property is further investigated separately by considering the temporal growth of the apparent stress at very low shear-rate, reflecting the material's microstructure rebuild up following shearing at different high shear rates. It is found that rebuilding characteristic time is roughly independent upon shear history, indicating that this is a material parameter. The influence of water dosage rate on the rheological behaviour is considered. As expected, apparent viscosity and yield stress decrease with increasing kneading water amount. The rebuilding up kinetics is found to be non sensitive to water dosage rate, suggesting that the material's processability would be preserved when changing this parameter, although significant creeping may be expected at high water dosage rates.

Cite this publication as follows:
Kaci A, Chaouche M, Andreani P-A, Brossas H: Rheological behaviour of render mortars, Appl. Rheol. 19 (2009) 13794.

Didier Lootens, Pierre Jousset, Camille Dagallier, Pascal Hebraud, Robert Flatt
The ''Dog Tail Test'': a quick and dirty measure of yield stress. Application to polyurethane adhesives

Appl. Rheol. 19:1 (2009) 13726 (7 pages)

It is observed that, although consisting on very different formulations, the rheological properties of filled polyurethane adhesives may be rescaled onto simple master curves, and described with a small number of parameters: a yield stress, a low frequency elastic modulus and a characteristic time of flow. As a consequence, very simple and qualitative measurements of their deformations, such as the Dog Tail Test, may be used to deduce these parameters. By comparing the values obtained from Dog Tail Test measurements to well-controlled rheological measurements and to finite element computation, we show that such a simple and qualitative test may be used as a tool to measure both the yield stress and the elastic modulus of highly viscoelastic systems

Cite this publication as follows:
Lootens D, Jousset P, Dagallier C, Hebraud P, Flatt R: The ''Dog Tail Test'': a quick and dirty measure of yield stress. Application to polyurethane adhesives, Appl. Rheol. 19 (2009) 13726.

Cristiano Ribeiro Santi, Elias Hage Jr., Carlos Alberto Correa, John Vlachopoulos
Torque Viscometry of Molten Polymers and Composites

Appl. Rheol. 19:1 (2009) 13148 (7 pages)

A systematic approach for collecting data from a torque rheometer is described, and the Bousmina et al. model is evaluated for HDPE, LDPE, LLDPE and HDPE/filler composites. The torque rheometer results are in good agreement to capillary and parallel plate viscometer measurements for neat polymers, when the torque values measured are corrected for the temperature rise due to viscous dissipation. For the composites, the torque and capillary results virtually coincide, but the viscosities are lower than those measured with the parallel plate instrument, in oscillatory mode, because the Cox-Merz rule is not valid. Although there are some limitations at high shear rates, due to viscous dissipation, the present work provides a proof and a methodology for the practical utility of torque rheometers for viscosity measurement in highly viscous systems.

Cite this publication as follows:
Santi CR, HageJr E, Correa CA, Vlachopoulos J: Torque Viscometry of Molten Polymers and Composites, Appl. Rheol. 19 (2009) 13148.

Primoz Ternik, Jure Marn
Numerical study of blood flow in stenotic artery

Appl. Rheol. 19:1 (2009) 13060 (11 pages)

In the present study,we investigate the behaviour of the human blood in a stenosed blood vessel. The human blood is studied as a Newtonian as well as non-Newtonian fluid. We consider three rheological models of the shear-thinning non- Newtonian models and compare them with the Newtonian model. The blood flow through a stenosed blood vessel is studied numerically by solving the three dimensional Navier-Stokes equation along with the continuity equation and particular rheological model. Distribution of velocity, pressure,wall shear stresses and flow recirculation characteristics are determined for two time steps of the cardiac cycle. Present results indicate a significant influence of the shear-thinning viscous behaviour of a human blood on the most important hemodynamic parameters that play a key role in formation of atherosclerotic plaques. Last but not least, a systematic grid refinement analysis as well as numerical accuracy study IS performed and present numerical results may be treated as the benchmark.

Cite this publication as follows:
Ternik P, Marn J: Numerical study of blood flow in stenotic artery, Appl. Rheol. 19 (2009) 13060.


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