Physics
Acoustic levitation
Trap a lightweight bead in the nodes of a standing sound wave.
Try this
Blue and orange rings show the alternating pressure field. Counter-propagating fronts form stationary pressure nodes where acoustic radiation force can support the bead. The display phase is slowed; the actual frequency is in kHz.
The model and its limits
One-dimensional small-sphere Gor’kov approximation in a prescribed standing wave with Stokes drag. No phased-array acoustic field or finite-size scattering solution.
Equations used in the module
Equations λ = c/f F_z = F_max sin(2kz) m z″ = F_z - mg - 6πμr z′
