Title: PARTICLE MOTION AND SEGREGATION IN PISTON DRIVEN FREE SURFACE FLOWS OF VISCOELASTIC FLUIDS
Page Range: p.319-326
Author(s): Ogadhoh S O; Papathanasiou T D
File size: 737K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 5
Abstract
Solid particle motion, redistribution and segregation is investigated in a viscoelastic fluid during piston-driven free surface flows. This phenomenon and its effect on suspension microstructure is examined with particular respect to the injection and compression moulding of composite materials. PMMA particles were dispersed in a hydrated hydroxypropyl guar gel. Particles were observed to move away from the piston and towards the free surface where they slowly accumulate, thus confirming theoretical predictions that in the presence of a normal stress gradient perpendicular to the direction of bulk flow, suspended particles tend to gravitate towards and then remain near the free surface. Simulations show that the speed of this segregation increases with fluid elasticity, shear rate and particle size, in agreement with literature models for the lateral migration velocity of particles in viscoelastic fluids.12 refs.
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