We suggest a dynamical mechanism for angular sorting of subwavelength particles according to their resonances and sizes, realized using the forces imposed by acoustic (ultrasound) waves with different wavelengths. We analyze how the acoustic force acting on a small particle depends on its size relative to the ultrasound wavelength, and how the detuning between the two different beams influences the size range and angular distribution for unambiguous sorting outcomes for a given size range. We predict a range of scenarios that depend on the particular materials, and we provide several feasible examples and discuss their practical realization.

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• Acoustic forces
• Fluid-particle interactions
• Linear acoustics
• Microfluidics
• Microparticles
• Acoustic tweezers