Abstract
A novel dynamic model of magnetic microbubble subjected to acoustic-magnetic field is developed by Lagrange method. Numerical works are effectively replaced by a non-magnetic microbubble immersed in highly magnetic fluid. Simulation shows that bubble’s pulsation and translation can be controlled by an applied uniform magnetic field. Depending on the coupled time scales between relaxation parameters, the oscillation of bubble can be improved or reduced by magnetic field. Besides, magnetic field significantly reduces bubble natural frequency due to the enhanced viscosity. Also, the properties of the magnetic fluid may affect bubble’s responses, such as viscosity and magnetic susceptibility. In the case of strong magnetic susceptibility and low viscosity, magnetic field has a remarkable effect on bubble manipulation. Finally, the larger bubble may have a better response to magnetic field. These results may be beneficial to the manipulation of magnetic microbubbles by a suitable magneto-acoustic field.
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