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Numerical study of electro-osmotic micro-mixing of Newtonian and non-Newtonian fluids

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This paper numerically studies the mixing quality of an electro-osmotic micro-mixer. An electrode array is symmetrically located on the surface of the micro-chamber with an inner cylindrical obstacle. The simulations are performed to obtain an optimal radius for inner cylinder. The effect of AC frequency, voltage value, liquid inlet velocity and angular velocity of inner cylinder is studied. It is found that the applied electric field significantly enhances the mixing rate. The results reveal that the mixing efficiency increases with the frequency, voltage value and angular velocity and decreases with the inlet velocity of fluids. It is demonstrated that the mixing efficiency is 71.02% and 97.67% for the angular velocity of 0.0148 and 1.148 rad/s, respectively. In addition, the results show that the mixing performance of shear-thinning fluids is higher than that of shear-thickening ones.

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Correspondence to Morteza Bayareh.

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Technical Editor: Jader Barbosa Jr., Ph.D.

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Usefian, A., Bayareh, M., Shateri, A. et al. Numerical study of electro-osmotic micro-mixing of Newtonian and non-Newtonian fluids. J Braz. Soc. Mech. Sci. Eng. 41, 238 (2019).

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