Side Branch Orifice

The side branch orifice is an acoustic filter element and behaves as a high pass filter.

The transmission loss of a side branch orifice is:
a = radius of main duct [m]
ab = radius of side branch [m]
L = length of side branch [m]
L' = effective length of side branch, taking into account the end correction [m]
if the hole is just a hole in the pipe then it will have an effective length equal to 1.7ab
k = wavenumber [m-1]

See also: Acoustic Filter Elements, Helmholtz Resonator, Quarter Wave Tube.

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Subjects: Noise & Vibration