## Slip Velocity and Lift

D.D. Joseph and D. Ocando
Department of Aerospace Engineering and Mechanics
and the Minnesota Supercomputer Institute,
University of Minnesota, Minneapolis, MN 55455, USA

October 2000 (revised December 2001)

Abstract

The lift force on a circular particle in plane Poiseuille flow perpendicular to gravity is studied by direct numerical simulation. The angular slip velocity , where is the angular velocity of the fluid at a point where the shear rate is and is the angular velocity of the particle, is always positive at an equilibrium position at which the hydrodynamic lift balances the buoyant weight. The particle migrates to its equilibrium position and adjusts so that is nearly zero because of . No matter where the particle is placed it drifts to an equilibrium position with a unique, slightly positive equilibrium angular slip velocity. The slip angular velocity discrepancy defined as the difference between the slip angular velocity of a migrating particle and the slip angular velocity at its equilibrium position is positive below the position of equilibrium and negative above it. This discrepancy is the quantity that changes sign above and below the equilibrium position for neutrally buoyant particles, and also above and below the lower equilibrium position for heavy particles. The existence and properties of unstable positions of equilibrium due to newly identified turning point transitions and those near the centerline are discussed.

The long particle model of Choi and Joseph [2001] that gives rise to an explicit formula for the particle velocity and the velocity profile across the channel through the center line of the particle is modified to include the effect of the rotation of the particle. In view of the simplicity of the model, the explicit formula for Up and the velocity profile are in surprisingly good agreement with simulation values. The value of the Poiseuille flow velocity at the point at the particle's center when the particle is absent is always larger than the particle velocity; the slip velocity is positive at steady flow.