Quote:
Originally Posted by Lupo  IIRC, Cox and D'Antonio claims that heat exchange is the secondary source of absorption with friction losses (viscous boundary layer losses) being the primary source of absorption in such devices. |
Uhm, I do not understand the reference. They are of course correct. It is a matter of physics. The heat exchange within the porous material between the areas of compression and rarefaction is what causes the speed of sound to decrease compared to open air. It is not a mode of sound absorption.
Andre