title: Anomalous mixing behaviour in rotationally actuated microfluidic devices.
abstract: We analyse the characteristics of two-fluid mixing in T-shaped microchannels on rotating platforms (Lab-on-a-Compact-Disk framework). Three regimes of mixing were identified based on the distinct flow behaviour in each of these regimes. A diffusion-based mixing regime was obtained for low rotation speeds. A Coriolis force based mixing regime was observed for intermediate rotation speeds, which introduced some nontrivial aspects in the mixing behaviour, which was explained through scaling analysis. At very high rotational speeds, rapid mixing close to the junction was achieved by exploiting flow instabilities (instability based mixing). A good agreement between the theoretical calculations and the experimental observations was obtained.
authors.affiliation: Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India, 721302.
authors.forename: Debapriya
authors.initials: D
authors.lastname: Chakraborty
authors.forename: Marc
authors.initials: M
authors.lastname: Madou
authors.forename: Suman
authors.initials: S
authors.lastname: Chakraborty
mesh_terms: D003312:Coriolis Force; D004058:Diffusion; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods; D011076:Polycarboxylate Cement / Q000737:chemistry; D012399:Rotation
chemical_list: D011076:Polycarboxylate Cement; C005506:polycarbonate