Abstract

This chapter presents the microrheology of dispersions. The general problem of microrheology is the prediction of the macroscopic rheological properties of a material from a detailed description of the behavior of the elements of which it is composed. The chapter describes the materials that are suspensions of rigid and deformable spheres and spheroids. It describes the behavior of these elements as seen under the microscope, first in isolation from each other and then in interaction, in dilute and concentrated suspensions undergoing laminar shear flow. It was found that provided the particle size is small compared to that of the tube, the rotation of rigid spheres and spheroids and the deformation of drops is the same as that found in Couette flow. However, deformable liquid drops migrated across the planes of shear toward the tube axis, whereas at these negligibly small particle Reynolds numbers rigid particles translated along paths parallel to the tube axis. This effect can be explained by taking into account both the drop deformation and the presence of the wall.

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