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Beat Birkhofer, Alban Debacker, Simone Russo, Stefano Ricci, Didier Lootens
In-line rheometry based on ultrasonic velocity profiles: comparison of data processing methods

Appl. Rheol. 22:4 (2012) 44701 (9 pages)

Ultrasonic Velocity Profiling with Pressure Drop (UVP+PD) is a technique, which allows the measurement of the shear rate dependent viscosity non-invasively in a laminar pipe flow. To assess the performance of different data processing approaches for the extraction of the rheometric values, model fluids are characterized under well defined flow conditions created with a piston setup. Considering the shear rate range available in the pipe flow, a good quantitative agreement is found between the in-line measurements and the off-line measurements made with a rotational rheometer

Cite this publication as follows:
Birkhofer B, Debacker A, Russo S, Ricci S, Lootens D: In-line rheometry based on ultrasonic velocity profiles: comparison of data processing methods, Appl. Rheol. 22 (2012) 44701.

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.


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