EFFECT OF BAFFLE GEOMETRY ON MIXING PERFORMANCE IN THE PASSIVE MICROMIXERS

10.22099/ijstm.2014.2500

Abstract

Micro and nano-fluidic mixing nowadays is a very important area in research due to its
crucial role in new technologies and applications such as biomedical and biochemical synthesis.
Due to the low velocities associated with microscale flow, it is often very difficult to mix fluids in
a rapid and homogeneous manner. One of the methods of enhancing fluid mixing is to obstruct the
fluid flow using vanes or panels known as baffles. In this paper, a Computational Fluid Dynamics
(CFD) approach is used to study the effect of baffles on the mixing performance in a passive
micromixer. The numerical method is verified by comparing its obtained results with experiments
and numerical results published earlier. Rectangular, semi-circular and triangular baffles have
been considered for investigating the effects of baffle geometry on mixing performance.
Furthermore, the effects of channel inlet angle and baffles offset in mixing performance are
studied. As the results show, there is a two-fold increase in mixing performance in the baffled
cases as opposed to the simple case.

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