Cross section changes in a wave guide (1)
Let us consider an acoustic wave guide whose cross section changes from
to
as shown below:
The continuity phenomena at the interface between the two elements (small tube, big tube) are expressed via:
a continuity of pressure and volume velocity on either side of the interface
(red line between the blue zone and yellow zone),a volume velocity of zero over the rest of
(yellow zone without taking into account the blue zone) which has a perfectly rigid wall.
