- Identification: GA103/06/1033 - Grant Agency of the Czech Republic
- Duration: 2006 - 2008
- Principal investigator: Doc. Ing. Martin Zatloukal PhD. (Faculty of Technology, Tomas
Bata University) - Co-investigator: Petr Filip CSc.
Subject of research
Coextrusion of two or more viscoelastic polymer melts gives rise an unusual flow phenomena - interfacial instabilities, which strongly destabilize the process. The objective of this project is to define the onset mechanism of these undesirable phenomena and to reveal relationships between processing, materials and die design parameters with the aim of optimizing production and determining critical parameters for setting the destabilizing phenomena. A novel fully predictive modeling strategy for the interfacial instability determination will be proposed for coextrusion flows and experimentally verified. Moreover, analysis of shear flows of visco-elasto-plastic fluids in single- and multiple-connected regions (e.g. in annuli) requires more fundamental approach concerning participation of a yield stress in a qualitative description of these flows. An emphasis in the individual Couette-Poiseuille flows will be paid to a possibility of derivation of the explicit relations (as e.g.)
