Computational dynamics of acoustically driven microsphere systems

Area of Science:

• Physics
• Computational physics
• Acoustics

Background:

• Microsphere manipulation is crucial in various scientific fields.
• Understanding acoustic field interactions with multiple microspheres is complex.

Purpose of the Study:

• To develop a computational framework for simulating microsphere dynamics under pulsed acoustic fields.
• To analyze field-induced interparticle interactions and trapping phenomena.

Main Methods:

• Combined molecular dynamics with a time-dependent integral equation solver.
• Utilized spherical harmonic basis functions for acoustic field representation.
• Derived equations of motion including nondissipative drag forces.

Main Results:

• Acoustic fields induce effective dipolar interactions between microspheres, dependent on their velocities.
• Ultrasound pulses primarily cause system translation.
• Observed cloud expansion and contraction influenced by initial geometry.

Conclusions:

• The framework accurately models microsphere dynamics in acoustic fields.
• Acoustic fields can be used to control microsphere cloud behavior.
• The findings have implications for acoustic manipulation and microparticle assembly.