Aren’t tiny little bowl resonators really Helmholtz resonators with very small volume, relatively large nozzle cross sectional area A and very small nozzle length L?
The resonant frequency of the Helmholtz resonator is directly proportional to the square root of the cross sectional area of the nozzle A and inversely proportional to both the square root of the length of the nozzle L and the square root of the volume V. Thus, very small volumes can have very high Fr.
The resonant frequency of the Helmholtz resonator is directly proportional to the square root of the cross sectional area of the nozzle A and inversely proportional to both the square root of the length of the nozzle L and the square root of the volume V. Thus, very small volumes can have very high Fr.