Nano Science and Technology Institute
Nanotech 2012 Vol. 2
Nanotech 2012 Vol. 2
Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational (Volume 2)
Chapter 5: Micro & Nano Fluidics

Numerical Study on a passive micromixer with sinusoidal channel walls

Authors:A. Afzal, K.-Y. Kim
Affilation:Inha University, KR
Pages:361 - 364
Keywords:micromixer, numerical analysis, sinusoidal channel, mixing index
Abstract:Mixing of liquid samples in microfluidic systems has attracted many researchers mainly due to small characteristic dimensions of these channels, absence of turbulence and small diffusion coefficients. Depending on the mode of operation, different realizations of micromixers have been developed. In the present study, a passive micromixer with sinusoidal walls is proposed. With wavelength as the geometrical parameter, the proposed micromixer is investigated for a wide Reynolds number range 0.1 ≤ Re ≤ 50. Ethanol and water are used as the working fluids for mixing. A mixing index is employed to evaluate the performance of the micromixer. The mixing index is found to have a strong dependence on wavelength of the sinusoidal channel walls. For a fixed path length, enhanced mixing was observed due to reduction in diffusion distance (0.1 ≤ Re ≤ 1) and stronger Dean vortices (Re >10) as the wavelength is decreased. Due to simple in-plane structure, the proposed micromixer can easily be realized and integrated with microfluidic systems.
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