Sound energy flux

  • Sound pressure
  • SPL
  • Sound velocity
  • Schallauslenkung
  • Sound acceleration
  • Sound intensity
  • Sound power
  • Sound energy density
  • Sound energy
  • Sonic flow
  • Acoustic impedance
  • Speed of sound

The sound flow, symbols q, unit m3 / s, is a sound field quantity in acoustics.

The volume velocity is obtained from the integral of the particle velocity v over a rang through area A, with only the directed perpendicular to the surface components of the particle velocity play a role:

The sound flow characterizes the volume of the transmission medium ( air) - caused by the sound pressure - per unit time ( 1 second) flows back and forth through an area A.

If all of the particles of the transmission medium to have a surface area A has the same sound velocity (speed) v, that is, when the rhythmic flow area A carried everywhere in phase, this can simplify the formula for the volume velocity:

This applies either where the area A is so selected that there has the sound velocity v everywhere the same phase (for example, on the surface of a sphere with a spherical sound source in the center ), or the flow cross- section, ie the dimension of the area A in each dimension is very small compared to the square of the wavelength.

Volume velocity and sound velocity are always in phase.

  • Sound
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