Shear-induced particle migration was investigated by using a continuum diffusive-flux model for the creep flow of nickel powder viscous concentrated suspension with shear-thinning characteristics. The model, together with flow equations, was employed for solving the non-Newtonian flow patterns and non-uniform particle concentration distribution of mono-modal suspensions in a pressure-driven tube flow. Particle volume fraction and velocity fields for the non-homogenous shear flow field were predicted. Experimental validation was conducted by measuring the distribution of particles on samples obtained from a specially design split die for a capillary rheometer, which confirmed that particles with non-Newtonian polymeric binder under pressure-driven tube flow migrated from high to low shear rate regions, resulting in an uneven distribution of particle concentration. This investigation has direct relevance to the runner design for injection molding of highly filled polymers.
|Number of pages
|Journal of Injection Molding Technology
|Published - 1 Mar 2002
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Polymers and Plastics