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Modeling rigid magnetically rotated microswimmers: rotation axes, bistability, and controllability
Farshad Meshkati1, Henry Chien Fu1
1Department of Mechanical Engineering, University of Nevada, Reno, Nevada, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 24, 2015
Summary
Magnetically actuated microswimmers offer biomedical potential. This study reveals that adjusting the magnetic field angle enhances control over microswimmer rotation and stability, enabling multiple stable orbits.
Area of Science:
- Physics
- Biomedical Engineering
- Fluid Dynamics
Background:
- Magnetically actuated microswimmers are gaining traction for biomedical uses.
- Understanding their dynamics is crucial for effective application.
Purpose of the Study:
- Investigate the dynamics of rigid, magnetically rotated microswimmers.
- Analyze orbit stability and control strategies.
Main Methods:
- Utilized a boundary element method to compute mobility matrices.
- Identified steady, periodically rotating orbits in a body-fixed frame.
- Evaluated orbit stability and magnetoviscous behavior.
Main Results:
- Mapped magnetoviscous behavior against Mason number and magnetic field angle.
- Described wobbling motion based on experimental parameters.
- Demonstrated multiple stable periodic orbits for given field strength and frequency.
Conclusions:
- Microswimmer controllability can be improved by adjusting the magnetic field's relative angle to its rotation axis.
- This finding is key for designing advanced micro-robotic systems.
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