Pipe noise - Peutz
SUBSONIC FLOW NOISE CAUSED BY TURBULENCE The following formula can be used to determine the sound power level (PWL ins in dB(A) 2) inside the pipe, which is caused by turbulence in a medium with a certain density, temperature and velocity: PWL ins = -5 + 60.lg(v f/v 0) + 10.lg(S/S 0) - 25.lg(T f/T 0) + 8.6.lg(D f/D 0) where: v f = flow speed in ... ................
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