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We studied the characteristics of self-excited oscillation of flow in collapsible tube. Velocity profile along the tube was measured using a laser Doppler velocimeter (LDV). The cross section of the tube was visualized using a laser light sheet, and its shape was picturized using a high-speed video camera. Flow rate and pressure at up- and downstreams of the tube were measured using a electromagnetic flowmeter (EMF) and a pressure transducer. The following results were obtained : when difference between pressures at upstream and downstream ends was maximum, cross-sectional area of the tube became minimum. Velocity profile inside the cross section was influenced a great deal by the shape and upstream and downstream shapes of the cross section. In the upstream of the collapsed position flow was blocked, and in its downstream flow separation took place.

Visualization of Cross-sectional Shape in Collapsible Tube during Self-excited Oscillation