Analysis of Squeeze Flow of a Bi-Viscosity Fluid Between Two Rigid Spheres

Granular matter mechanics studies the balance and characteristics of motion, as well as the application of the granular matter, and looks mainly at dry particle systems. At present, one of the difficulties is understanding the squeeze flow and tangential movement of an interstitial liquid between particles. The use of the Bingham fluid model in the problem of squeeze flow results in no relative movement between two spheres or parallel disks, called the yield-surface paradox; the fluid model is too ideal to describe the physical nature. The group from the China Agricultural University studied deeply normal and tangential movement of an interstitial liquid between two spheres. They obtained analytical solutions for squeeze viscous forces, as well as the tangential force and moment, furthering the development of this difficult problem.