Drag and lift forces acting on a spherical bubble in homogeneous shear flow

Drag and lift forces acting on a spherical bubble in a homogeneous linear shear flow were numerically investigated by means of a three dimensional direct numerical simulation based on a marker and cell (MAC) method. The effects of fluid shear rate and particle Reynolds number on drag and lift forces acting on a spherical bubble were compared with those on an inviscid bubble. The results show that the drag force acting on a spherical bubble in a linear shear flow increases with shear. The behavior of the lift force on a bubble is quite similar to that on an inviscid bubble, but the effects of fluid shear rate on the lift force acting on a spherical bubble in the linear shear flow become bigger than that acting on an inviscid bubble in the particle Reynolds number region of 1≤ Rep ≤300.