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Patrick D. Anderson, Peter Van Puyvelde
8th Annual European Rheology Conference (ERC 2013)
Appl. Rheol. 23:4 (2013) 235-236
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► Cite this publication as follows:
Anderson PD, VanPuyvelde P: 8th Annual European Rheology Conference (ERC 2013), Appl. Rheol. 23 (2013) 235.
Patrick D. Anderson, Joseph Dooley, Han E.H. Meijer
Viscoelastic effects in multilayer polymer extrusion
Appl. Rheol. 16:4 (2006) 198-205
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The effect of viscoelasticity on multilayer polymer extrusion is discussed. In these coextrusion processes predetermined
patterns are created with a remarkable breadth of complexity even in geometrically simple dies via
elastic rearrangements caused by the second-normal stress differences. A computational method is offered,
based on the mapping method, which quantitatively describes the flow-induced patterns. Besides that the
results are esthetically beautiful, they are also relevant for practice, since process and die design optimization
is now possible. Not only to minimize interface distortion, but potentially also to deliberately create new processes
and products based on this flow-induced patterning of polymers.
► Cite this publication as follows:
Anderson PD, Dooley J, Meijer HEH: Viscoelastic effects in multilayer polymer extrusion, Appl. Rheol. 16 (2006) 198.
P.D. Anderson, H.E.H. Meijer
Chaotic mixing analyses by distribution matrices
Appl. Rheol. 10:3 (2000) 119-133
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Distributive fluid mixing in laminar flows is studied using the concept of concentration distribution mapping matrices,
which is based on the original ideas of Spencer & Wiley [1], describing the evolution of the composition of two
fluids of identical viscosity with no interfacial tension. The flow domain is divided into cells, and large-scale variations
in composition are tracked by following the cell-average concentrations of one fluid using the mapping method of
Kruijt et al. [2]. An overview of recent results is presented here where prototype two- and three-dimensional timeperiodic
mixing flows are considered. Efficiency of different mixing protocols are compared and for a particular example
the (possible) influence of fluid rheology on mixing is studied. Moreover, an extension of the current method
including the microstructure of the mixture is illustrated. Although here the method is illustrated making use of these
simple flows, more practical, industrial mixers like twin screw extruders can be studied using the same approach.
► Cite this publication as follows:
Anderson PD, Meijer HEH: Chaotic mixing analyses by distribution matrices, Appl. Rheol. 10 (2000) 119.
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