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In case the rubber tube is squeezed like an orifice, the orifice opening changes according to the pressure variations near the orifice. Under the given supply pressure, there is a maximum point on the flow rate, dependent on the downstream pressure. In the region of positive dQ/dP, the flow vibrations are excited, mostly, in the downstream side of the squeezed portion in the tube. The frequency is close to the natural one of the tube, with the one end open at the water tank, and the other end closed at the squeezed point. The frequency of rubber-metal connected tube can be estimated by the addition of the concentrated mass of the fluid in the metal tube to the distributed system of the rubber tube. The characteristics of the flow rate, the variation propagation, and the excitation conditions are explained.

Fluid Vibrations in the System Composed of Locally Squeezed Rubber Tube (Higher than the Atmospheric Pressure in a Tube)