Lighthill equation

Equation relating the acoustic noise power $\begin{array}{l}N\end{array}$ produced by a flowing fluid through a conduit:

(1)	$\begin{array}{l}\displaystyle N = \frac{\rho \cdot D^2 \cdot u^8 }{\mbox{v}^5}\end{array}$

where

$\begin{array}{l}N\end{array}$	acoustic noise power
$\begin{array}{l}u\end{array}$	fluid velocity
$\begin{array}{l}\mbox{v}\end{array}$	speed of sound in a fluid
$\begin{array}{l}\rho\end{array}$	fluid density
$\begin{array}{l}D\end{array}$	characteristic linear dimension of the fluid conduit

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