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Numerical Analysis of the Micro-mixer Uses Hydrodynamic Instability

Abdelhakim Benali*, Brahim Dennai and Rachid Khelfaoui

The micro mix is particularly interesting for many micro fluidic applications. In micrometric size of the devices, achieving an effective mixing is often difficult, due to the laminarization of the flow. Many solutions are proposed in the literature to overcome this issue. As an example, effective mixing can be achieved by using a secondary pulsed flow to destabilize the diffusion layer between the two fluids to be mixed. This layer is then stretched and folded which leads to an improved chaotic mixture. However, this technique requires specific actuation, making the micro system more complex and knives. Our idea is based on a mixer used hydrodynamic instability generated by a micro fluidic oscillator to destabilize the diffusion layer between the two fluids to be mixed, We add that the idea can be printed easily on a silicon plate and cheaper and The oscillators generally have a simple geometry and can be considered as a vibratory system at a frequency and an amplitude which is represented by an injected mass flow. In this work, we study an integrated mixer with a micro oscillator; several cases are studied numerically for liquid fluids using the CFD code. Practically, we want to follow numerically the variation of the efficiency of micro fluidic mixer in parallel with the change in the frequency of injection of the two phases has mixed.