... turbine, disc turbine, saw-teeth type, propeller, hydrofoil, Bulmarking type, screw, hellical ribbon, anchor and gate type, and other special ... type and high viscosity type.Paddle, open turbine, disc turbine, saw-teeth type, propeller, hydrofoil, Bulmarking type are low viscosity type ... Screw, hellical ribbon, anchor and gate type are high visocity type impellers, usually operating at laminar or ...