Simulation of nano fibers and filter efficiency.

Andreas Wiegmann, Liping Cheng & Stefan Rief
Fraunhofer ITWM, Kaiserslautern, Germany


Nano filtration media have become increasingly interesting for filtration applications. 
The benefit of using nano fibers is the improvement with respect to filter efficiency and 
the relatively low pressure drop due to the nano slip. 

At the Fraunhofer ITWM, the simulation of filter media and filtration processes is traditionally 
performed resolving the smallest scale of the media. When entering the nano regime, two problems 
arise: First, the structures under consideration become huge in terms of computational grids. 
Hence, special algorithmic approaches have to be followed to overcome this hurdle. Second, the 
models for fluid flow and particle movement have to be extended by new physical effects like slip flow. 

The presentation gives an overview on the latest developments concerning nano filtration in 
the Fraunhofer software suite GeoDict / FilterDict.

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Last modified: Mon Oct 18 10:45:15 W. Europe Standard 2010