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Steering of Liquid Mixing Speed in Interdigital Micro Mixers – From Very Fast to Deliberately Slow Mixing
Author(s) -
Löb P.,
Drese Klaus S.,
Hessel V.,
Hardt S.,
Hofmann C.,
Löwe H.,
Schenk R.,
Schönfeld F.,
Werner B.
Publication year - 2004
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200401995
Subject(s) - mixing (physics) , micromixer , materials science , inert , microfabrication , microfluidics , range (aeronautics) , mechanics , mechanical engineering , fabrication , composite material , nanotechnology , chemistry , engineering , physics , medicine , alternative medicine , organic chemistry , pathology , quantum mechanics
Very fast mixing in the range of milliseconds as well as deliberately slow mixing was realized by specially adjusted interdigital micro mixers made of glass or stainless steel. The corresponding micro mixers are presented including experimental and theoretical investigations of the respective mixing process. Fast mixing was realized by combination of flow multilamination by interdigital microstructured feeding structures with geometric focusing. Details on the microfabrication, achievable throughputs and hydrodynamics are discussed. To prevent clogging of microsized feeding structures in the case of precipitation reactions, mixing was deliberately slowed down by separating the reactant solutions at the outlet by additional layers of inert liquids.