Effect of initial axial strain of collapsible tube on self-excited oscillation

In this study, an experiment was performed to investigate the dynamic chara cteristics of flow in a collapsible tube. The effect of initial axial strai n of the tube on self-excited oscillation tvas studied by changing the init ial stretch of a silicone rubber tube at various values of the flow rate. T he frequency of oscillation and the time-dependent pressure and flow rate w ere measured at the upstream and the downstream location of the tube. The c haracteristics of the self-excited oscillation were strongly affected by th e initial strain in a range of smaller flow rate and smaller initial tube s tretch. Three different types of oscillation were observed in the present c ondition. The type of oscillation changes due to variation of the initial a xial strain or the supply flow rate.