Affordable Access

Numerical Modelling of Non-Newtonian Fluid in a Rotational Cross-Flow MBR

IWA Publishing Company
Publication Date
  • Cfd
  • Shear Stress
  • Non-Newtonian
  • Rotating Cross-Flow Mbr


Fouling is the main bottleneck of the widespread of MBR systems. One way to decrease and/or control fouling is by process hydrodynamics. This can be achieved by the increase of liquid crossflow velocity. In rotational cross-flow MBR systems, this is attained by the spinning of e.g. impellers. Validation of the CFD model was made against LDA tangential velocity measurements (error less than 8 %) using water a fluid. The shear stress over the membrane surface was inferred from the CFD simulations for water. However, activated sludge is a non-Newtonian liquid, for which the CFD model was modified incorporating the non-Newtonian behaviour of activated sludge. Shear stress and area-weighted average shear stress relationships were made giving error less that 8 % compared to the CFD results. An empirical relationship for the area-weighted average shear stress was developed for water and activated sludge as function of the angular velocity and the total suspended solids concentration.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times