Kinematics and deformation of ferrofluid droplets under magnetic actuation |
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Authors: | Nam-Trung Nguyen Ali Beyzavi Kon Meng Ng Xiaoyang Huang |
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Affiliation: | (1) School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore, 639798 |
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Abstract: | This paper reports the experimental results on kinematics and deformation of ferrofluid droplets driven by planar coils. Ferrofluid
droplets act as liquid magnets, which can be controlled and manipulated by an external magnetic field. In our experiments,
the magnetic field was generated by two pairs of planar coils, which were fabricated on a double-sided printed circuit board.
The first pair of coils constrains the ferrofluid droplet to a one-dimensional motion. The second pair generates the magnetic
gradient needed for the droplet motion. The direction of the motion can be controlled by changing the sign of the gradient
or of the driving current. Kinematic characteristics of the droplet such as the velocity–position diagram and the aspect ratio
of the droplet are investigated. The analysis and discussion are based on the different parameters such as the droplet size,
the viscosity of the surrounding medium, and the driving current. This simple actuation concept would allow the implementation
of lab-on-a-chip platforms based on ferrofluid droplets. |
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Keywords: | |
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