An Experimental Investigation On The
Narrow Annular-flow-induced Vibration
Instability Of A Tube
Author(s)
H. S. Kang, N. K. Muriethi & M. J. Pettigrew
Abstract
The stability of a simply-supported tube subjected to annular flow in a finitelength
narrow gap support is experimentally investigated. The exit boundary
condition of the annular-leakage passage is known to be a possible cause of
instability of the inner tube. In this study, therefore, several finite-length gap
supports considering two diffuser angles were investigated on the effects of the
annular gap and diffuser angle to the instability of the inner tube. Numerous
experiments with the different supports have been performed in a transparent
plexiglass tube so that a basic annular-flow can be provided for the inner tube
and the movement of the tube can be measured by several laser vibrometers. It is
observed that (1) the tube loses stability by flutter at very low flow velocity; the
highest critical flow velocity is 3 m/s, (2) the critical flow velocity is strongly
dependent on the annular gap size, the diffuser angle and the combination of
both, and (3) generally the smaller the gap the lower the critical flow velocity.
Keywords: instability, axial-flow-induced vibration, annular flow, finite-length
narrow gap support, leakage flow.
1 Introduction
Several methods to predict the dynamic behavior of the rod subjected to an
annular flow have been developed, These include the linearized potential flow
theory based model by Mateescu and Paidoussis [1, 2] and Mateescu et al. [3],
Keywords
instability, axial-flow-induced vibration, annular flow, finite-lengthnarrow gap support, leakage flow
Related Book
Other papers in this volume
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