Sound energy flux
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|Sound pressure||p · SPL|
|Particle velocity||v · SVL|
|Sound intensity||I · SIL|
|Sound power||P · SWL|
|Sound energy density||w|
|Sound exposure||E · SEL|
|Sound energy flux||Q|
|Speed of sound||c|
Sound energy flux is the flow rate of sound energy through a specified area.
- A is the area, measured in m2;
- p is the sound pressure, measured in Pa;
- v is the particle velocity, measured in m·s−1.
In a medium of density ρ for a progressive plane sound wave with speed c, the sound energy flux Q through a surface of area A with an angle θ between the direction of propagation of the sound and the normal to the surface, corresponding to an effective sound pressure p is:
For example a sound at SPL = 85 dB or p = 0.356 Pa in air (ρ = 1.2 kg·m−3 and c = 343 m·s−1) through a surface of area A = 1 m2 normal to the direction of propagation (θ = 0 °) has a sound energy flux Q = 0.3 mW.
This is the parameter one would be interested in when converting noise back into usable energy, along with any losses in the capturing device.
- Landau & Lifshitz, "Fluid Mechanics", Course of Theoretical Physics, Vol. 6
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