Affiliations: [a] Wuhan National High Magnetic Field Center, Huazhong
University of Science and Technology, Wuhan, Hubei, China | [b] State Key Laboratory of Advanced Electromagnetic
Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
Correspondence:
[*]
Corresponding author: Xiaotao Han, Wuhan National High Magnetic Field Center and State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of
Science and Technology, Wuhan 430074, Hubei, China.
E-mail: xthan@mail.hust.edu.cn
Abstract: A simple active microfluidic mixing system based on magnetic
actuation strategy of fluids in the microchannel under a hybrid gradient
magnetic field was proposed. The hybrid magnetic field, combined of a static
gradient magnetic field and an external AC uniform magnetic field, is specially
designed to generate periodic magnetic body forces acting on the mixed fluids.
Two-dimensional numerical simulation has been performed to investigate the
mixing behavior caused by the interactions of magnetic field, fluid flow and
convection-diffusion. Numerical results show that the proposed mixer system
achieved up to 97% mixing of the two fluids with a small current flowing in
micromagnets.
Keywords: Microfluidic mixing, gradient magnetic field, magnetic force, finite element analysis
