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Leon E. Govaert, Han E.H. Meijer
DYFP2006, the 13th int. conference on deformation, yield and fracture of polymers

Appl. Rheol. 16:5 (2006) 290-291

Since its start in 1970, the international conference on Deformation, Yield and Fracture of Polymers has been held every three years in Churchill College, Cambridge, UK. Amongst the 'mechanical properties of polymers' aficionados these meetings have become known as the 'Churchill' conferences, an event that has been established as the leading conference on its subject world wide. ...

Cite this publication as follows:
Govaert LE, Meijer HEH: DYFP2006, the 13th int. conference on deformation, yield and fracture of polymers, Appl. Rheol. 16 (2006) 290.

Patrick D. Anderson, Joseph Dooley, Han E.H. Meijer
Viscoelastic effects in multilayer polymer extrusion

Appl. Rheol. 16:4 (2006) 198-205

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

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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