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Simulation of helical flows in microchannels
Author(s) -
Schönfeld Friedhelm,
Hardt Steffen
Publication year - 2004
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10071
Subject(s) - micromixer , reynolds number , micromixing , vortex , mechanics , computational fluid dynamics , secondary flow , transverse plane , flow (mathematics) , open channel flow , microchannel , channel (broadcasting) , physics , materials science , geometry , microfluidics , mathematics , engineering , thermodynamics , turbulence , structural engineering , telecommunications
Helical flows are investigated in structured microchannels with regard to micromixing by means of computational fluid dynamics (CFD). In the case of bas‐relief structured channels the numerical results are found to be in good agreement with experimental findings. The magnitude of the transverse flow is computed for various Reynolds numbers and for different geometries including channels with bas‐relief structures on two opposite walls. Transverse flows in structured microchannels are compared to secondary flow patterns in curved square channels. The corresponding helical flows are analyzed for Dean numbers ranging from 1 to 900. Special attention is paid to the occurrence of additional vortices close to the center of the outer channel wall. Based on the results a new type of micromixer is proposed that relies on the transition of the secondary flow pattern from two to four vortices. © 2004 American Institute of Chemical Engineers AIChE J, 50: 771–778, 2004