Nano Filtration Media - Challenges of Modelling and Computer Simulation
L. Cheng, S. Rief, A. Wiegmann
FRAUNHOFER ITWM KAISERSLAUTERN
Nano filtration media become increasingly interesting for filtration applications as the production
of nano fibers becomes cheaper. The benefit of adding nano fibers to micro fibers is the enormous
improvement with respect to filter efficiency and the relatively low pressure drop add-on due to
At the Fraunhofer ITWM, the simulation of filter media and filtration processes is traditionally performed
resolving the smallest scale of the media. This approach has the advantage of keeping the model
hierarchy low and the number of model parameters small. However, when entering the nano regime,
two problems arise: The structures under consideration become huge. Hence, special algorithmic
approaches have to be followed to overcome this hurdle. Moreover, the models for fluid flow and particle
movement have to be extended by new physical effects like slip flow phenomena.
The paper gives an overview on the latest developments concerning nano filtration in the Fraunhofer
software suite GeoDict / FilterDict.