  A nearly two-dimensionnal foam is generated inside a Hele-Shaw cell
half-filled with a surfactant solution. The cell is then placed vertically on a
tumbler so that it rotates around its center with the cell angular velocity as
the control parameter. During the foam rotation the liquid fraction increases
and the foam/liquid interface deforms. The shear velocity profiles generated
inside the foam are studied along two representative lines. The foam
rheological properties are obtained using statistical tools and allow us to
determine the foam effective viscosity. A semiempirical model is proposed for
these velocity profiles, emphasizing the significance of the viscous
dissipations between the bubbles and with the cell walls.
