Bulk Flow and Mixing are achieved by the impellers. Most reactors use the Rushton
Flat-bladed disc turbine seen in the diagram. Fluid flow in a reactor can be described
as Newtonian or non-Newtonian. Newtonian fluids show constant viscosity and linear
shear rate against shear stress. However many fluids are non-Newtonian and are
described as Bingham or Pseudoplastic.