Interface generation in Kenics static mixers: optimization

This paper addresses the interfacial area generation in Kenics static mixers using the extendedmapping method. This method utilizes a statistical description of the microstructure using theso-called area tensor and is restricted to systems with negligible interfacial tension. However, thelayered structures created in a Kenics are a good example where interfacial tension does not playan important role (the layered structure is retained). This method is adopted to the special flowconditions in spatially periodic flows, of which a static mixer is an example. The efficiency of theinterface generation for differentmixer layouts is compared and additional attention is given to thedistribution of the interfacial area across the mixer. It is shown that the extended mapping methodenables us to find the blade configuration that optimizes t! hemixing performance, including detailsconcerning the microstructure development in this chaotic flow. Additional attention is given tothe material exchange between the near-wall regions and the core of the flow (important becauseof possible polymer degradation phenomena in case of very long residence times).