FLUID-FLOW IN A ROTATING CYLINDRICAL CONTAINER WITH A ROTATING-DISK AT THE FLUID SURFACE

Fluid flow in a rotating cylindrical container of radius R-w and heigh t H with a co-axially rotating disk of radius R-d at the fluid surface is numerically investigated. The container and the disk rotate with a ngular velocities Omega(w) and Omega(d), respectively. We solve the ax isymmetric Navier-Stokes equations using a finite-volume method. The e ffects of the relative directions and magnitudes of the disk and conta iner rotations are studied. The calculations are carried out with vari ous ratios of Omega(w) and Omega(d) for H/R-w = 2 and R-d/R-w = 0.7. S treamlines and velocity vectors in the meridional plane and azimuthal velocities are obtained. The flow fields in the meridional plane are d iscussed with relation to azimuthal velocities in the interior of the container. The numerical results are also compared with experimental d ata.