Abstract
Using a flexible pressure catheter, we investigated the relationship between local cross-sectional area and local internal pressure in highly deformed collapsible tube during self-excited oscillation. We measured the cross-sectional shape of the collapsible tube during self-excited oscillation at several different positions along the tube using a laser light sheet and a high speed video camera. At the same time, internal pressure of the tube was measured using a flexible pressure catheter. This catheter was inserted in the tube from the downstream rigid tube end. The results showed that the amplitude of the wave form of cross-sectional area became smaller from downstream to upstream position in the upstream region from the most highly collapsed position. Wave forms of internal pressure and cross sectional area had two peaks during one period of the oscillation.
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