Absorption silencer question
Discussion
Is an absorption type silencer's noise reducing ability related to the internal area of the perforated tube?
In other words, take two silencers of identical external dimensions; say 600mm long, 180mm diameter). Both have inlet/outlet diameters of 65mm. Silencer A has a straight 65mm perforated pipe through the middle. Silencer B has a pipe that starts at the 65mm inlet, splits smoothly into two 45mm pipes and then rejoins smoothly into the 65mm outlet - the two smaller pipes are 25mm apart. The perforation size/spacing is identical throughout and the same type/density of absorption material is used in both silencers.
Which silencer would be quieter?
In other words, take two silencers of identical external dimensions; say 600mm long, 180mm diameter). Both have inlet/outlet diameters of 65mm. Silencer A has a straight 65mm perforated pipe through the middle. Silencer B has a pipe that starts at the 65mm inlet, splits smoothly into two 45mm pipes and then rejoins smoothly into the 65mm outlet - the two smaller pipes are 25mm apart. The perforation size/spacing is identical throughout and the same type/density of absorption material is used in both silencers.
Which silencer would be quieter?
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