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Due to scaling laws, in microfluidic, flows are laminar. Consequently, mixingbetween two liquids is mainly obtained by natural diffusion which may take along time or equivalently requires centimetre length channels. To reduce timeand length for mixing, it is possible to generate chaotic-like flows either bymodifying the channel geometry or by creating an external perturbation of theflow. In this paper, an active micromixer is presented consisting on thermalactuation with heating resistors. In order to disturb the liquid flow, anoscillating transverse flow is generated by heating the liquid. Depending onthe value of boiling point, either bubble expansion or volumetric dilationcontrolled the transverse flow amplitude. A chaotic like mixing is then inducedunder particular conditions depending on volume expansion, liquid velocity,frequency of actuation... This solution presents the advantage to achievemixing in a very short time (1s) and along a short channel distance (channelwidth). It can also be integrated in a more complex device due to actuatorintegration with microfluidics.

An Active Chaotic Micromixer Integrating Thermal Actuation Associating PDMS and Silicon Microtechnology