Final Thesis

Static Mixer Enhanced Nanofiltration of Non-Newtonian Fluids.

Key Info

Basic Information

Chemical Process Engineering
Masterthesis / Bachelorthesis
Focus/Key Topic:
experimental / constructive / simulativ


Nanofiltration is a relevant separation process in today’s industry. Membranes suited for this application retain solutes in nanometer size range. Membrane permeability for the solute or solvent indicate the transport properties through the membrane. However, negative effects like concentration polarization and fouling reduce the efficiency of the process.

Recent research proposes the use of static mixers inside membrane modules for tackling named phenomena. Those create vorticity and high sear rate close to the membrane. This way better mixing and higher back transport of particles into the bulk phase is introduced. This method is also very promising for processing non-Newtonian fluids.

This thesis combines simulative and laboratory work of variable shares. The task is to investigate the influence of static mixers on membrane filtration of shear thinning fluids. The simulative part includes the expansion of an existing CFD model in COMSOL by an expression of shear thinning behaviour. Rheologic data is measured and fitted to the model. The completed model is used for a parameter study.

An existing static mixer design is adapted to the new experimental setup in the experimental part. It is then fabricated by 3D printing. Nano filtration experiments of shear thinning fluids are conducted using the final setup. The results are interpreted and used for validation of the simulation.

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