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Accepted Papers
Effects of Obstacle Shapes on Mixing Performances of Two Layer Crossing Channels Micromixer with Crossing Circular Chambers

Mouissi Ahmed1, Douroum Embarek2, *, Kouadri Amar3, Brihmat Mostefa4, 1Mechnical Engeneering departement, University of Djelfa, Djelfa 17000, Algeria, 2Laboratory of materials and reactive systems, LMSR, University of Sidi Bel Abbes 22000, Algeria, 3Mechnical Engeneering departement, University of Djelfa, Djelfa 17000, Algeria, 4Mechnical Engeneering departement, Sidi Bel Abbes university, Sidi Bel Abbes 22000, Algeria

ABSTRACT

Micromixers are vastly used in several industrial areas, they represent important components in microfluidic systems and have many uses in the fields of bioengineering and chemical engineering. In microfluidics, fluid mixing can be provided by the physical phenomenon of chaotic advection. The idea is to exploit the chaotic Two Layer Crossing Channel micromixer, which allows efficient mixing at low Reynolds numbers. In this study, the exploited idea is to examine the effect of circular crossing chambers using different shape of obstacles on the improvement of hydrodynamic mixing performances. Five micromixer models have been designed: without obstacle, square obstacle, triangular obstacle, circular obstacle, and rhombic obstacle. Numerical simulations have been carried out using CFD Fluent code to solve the governing equations such as: the momentum equations, the continuity equation, and the species transport equation. The Reynolds number varies between 1 and 50. The obtained results have been analysed using mixing index, mass fraction contours, pressure drops, and mixing energy cost. The obtained findings show that the micromixer with square obstacles has high mixing index values which exceeds 0.832 and reaches 0.997 for all the values of Reynolds number, it also presents low mixing energy costs.

KEYWORDS

TLCCM Micromixers, Circular Crossing Chambers, Chaotic Advection, Mixing Index, Mixing Energy Cost.


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