Kuiper G. L., Metrikine A.V.


Stability of a submerged aspirating pipe: the effect of fluid depressurization at the inlet


Journal of Sound and Vibration 280 (2005) 1051-1065



Summary. Studying stability of a vertically suspended, fully submerged pipe aspirating water (water riser), researchers have found a contradiction between theoretical predictions and experiments. Theory predicts instability at small velocities of aspiration, while experiments did not show such instability. The only attempt to explain this contradiction was made by Pa´doussis [1]. He suggested that the theoretical prediction is wrong because of an improper description of the negative pressurisation of water at the inlet of the pipe and proposed a description, which improves the theory. In this paper, it is shown that the negative pressurisation influences the stability only slightly and can not explain the contradiction.