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Anja Vananroye, Peter Van Puyvelde, Paula Moldenaers
Morphology development during microconfined flow of viscous emulsions

Appl. Rheol. 16:5 (2006) 242-247

In this contribution, a brief review is given of the dynamics of emulsions in microconfined shear flow. The interest in confined flow is triggered by the increasing importance of microfluidic applications in the processing industries. In a first part, some important aspects of confinement on single droplet dynamics are highlighted. The validity of the conclusions drawn from this part are subsequently applied to more concentrated systems. It is shown that microconfined emulsions can exhibit rich dynamics, and can display some peculiar morphologies.

Cite this publication as follows:
Vananroye A, VanPuyvelde P, Moldenaers P: Morphology development during microconfined flow of viscous emulsions, Appl. Rheol. 16 (2006) 242.

M. Kroger, P. Moldenaers
Rheology and Microstructure of Complex Fluid Systems. Symposium in Honour of Prof. Jan Mewis

Appl. Rheol. 15:1 (2005) 46-47

Cite this publication as follows:
Kroger M, Moldenaers P: Rheology and Microstructure of Complex Fluid Systems. Symposium in Honour of Prof. Jan Mewis, Appl. Rheol. 15 (2005) 46.

Peter Van Puyvelde, Paula Moldenaers
Sunny Rheology School in Leuven

Appl. Rheol. 13:6 (2003) 317

Cite this publication as follows:
VanPuyvelde P, Moldenaers P: Sunny Rheology School in Leuven, Appl. Rheol. 13 (2003) 317.

Alain Goubert, Jan Vermant, Paula Moldenaers, Axel Göttfert, Benoit Ernst
Comparison of measurement techniques for evaluating the pressure dependence of the viscosity

Appl. Rheol. 11:1 (2001) 26-37

The different methods that can be used for measuring the effect of a hydrostatic pressure on the viscosity of polymer melts are evaluated. A linear low-density polyethylene is chosen as test material, as it can be expected to have a small pressure dependency. Special attention is given to methods employing capillary rheometry, as these methods yield a range of shear rates and pressures that are typically encountered under polymer processing conditions. The accuracy of the different techniques is evaluated considering also the complexity of the experimental devices. First it is investigated to which extent standard capillary rheometry can be used to extract information about the pressure dependency of the viscosity. Secondly, it is shown how the accuracy can be greatly increased by the simple addition of a pressure chamber below the exit of the capillary, with a needle valve to regulate the back pressure. The results from this device are compared with those from a more robust method using a pressurized double piston rheometer and with literature data. The experimental values for the pressure coefficient of the viscosity will also be compared with those predicted from PVT data using Utracki's method.

Cite this publication as follows:
Goubert A, Vermant J, Moldenaers P, Gö, ttfert A, Ernst B: Comparison of measurement techniques for evaluating the pressure dependence of the viscosity, Appl. Rheol. 11 (2001) 26.


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