Abstract
T-shaped channels are widely used as micro-mixers in microfluidic systems for chemical and biochemical engineering applications. The mixing efficiency of T-shaped channels relies on three-dimensional flow structure which is dependent on Reynolds number. The most favourable flow regime with relation to the mixing efficiency is an unsteady engulfment flow regime, which has a periodic nature. In the present work, the spatial and temporal scales formed in a T-shaped channel are studied at Reynolds number corresponding to unsteady three-dimensional flow regime. The combination of PLIF and PIV techniques with the high temporal resolution was used in the T-channel cross-sections to investigate the evolution of velocity and concentration fields.
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