Relationship of Pressure Wave Velocity to Self-Excited Oscillation of Collapsible Tube Flow

Measurements of dynamic tube deformation were conducted using a laser displacement meter supported on a pulse motor stage together with an electromagnetic flow meter. The results have clarified that fluid velocity approaches pressure wave velocity, which is estimated from the tube law, at the throat around the stability boundaries and that a supercritical flow and subcritical flow occur alternately during oscillations. By contrast, a linearized lumped parameter model has been developed