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Vol. 111, Issue 12, December 2009, pp. 79-85




Numerical Analysis of an Oscillating Micromixer


*B. Dennai, *R. Khelfaoui, **B. Benyoucef, *A. Slimani, *A. Maazouzi
and *A. Missoum

* Laboratory LPDS, University of Bechar, Algeria

Tel: 0021349819204, fax: 0021349819204

** University of Abu Bakr Belkaid, Tlemcen, Algeria

E-mail: khelfaouidz@yahoo.fr



Received: 21 October 2009   /Accepted:  22 December 2009   /Published:  30 December 2009


Abstract: Micromixing is particularly interesting for many microfluidic applications. In micrometric size devices, reaching an efficient mixing is often difficult, due to laminarization of the flow. Several solutions are proposed in the literature to overcome this issue. As an example, efficient mixing may be obtained using a secondary pulsed flow to destabilize the diffusion layer between the two fluids to mix. This layer is then stretched and folded, which leads to an improved chaotic mixing [Dodge et al., 2004]. However, this technique requires a specific actuation, which makes the microsystem more complex. In this paper, we study an autopulsating micromixer based on a microfluidic oscillator, the principle of which takes advantage of the Coanda effect. Oscillations of the flow are self generated, which widely simplifies the micromixer design. Different geometries are numerically investigated both for liquid and gaseous fluids using the CFD Code. The simulated frequency of oscillations is compared with analytical predictions and experimental data obtained in a millimetric sized mixer. Mixing efficiency is quantified and discussed in function of the flow structure, both for incompressible and compressible fluids, for millimetric and micrometric sizes


Keywords: Micro fluidic, Oscillator, Micro mixer


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