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Abstract
The viscosity of an emulsion, consisting of oil droplets and surrounding water, is highly dependent on the position of the droplets during fluid transport. To better understand this rheological phenomenon, the migration of nylon spheres of various densities, flowing through a vertical, rectangular channel was studied.
The results from the present experiments show that spheres which have lower density than the fluid always migrate to the center of the channel, almost independent of density difference and sphere size. If on the other hand, the spheres are only slightly more dense than the fluid, they will reach an equilibrium position near, or at one of the channel walls. If the spheres are still denser than the fluid they will reach an equilibrium position somewhere between the wall and the center of the channel. This position depends on the sphere size.
A theory is presented which gives good agreement with the experimental results, and thus can be used to describe the flow of a dilute emulsion.
Presented at the 42nd Annual Meeting in Anaheim, California May 11–14, 1987
Notes
Presented at the 42nd Annual Meeting in Anaheim, California May 11–14, 1987