Authors
Abstract
This paper investigates the effect of end conditions on the vibration characteristics
of a pipe conveying fluid with different cross sections such as (sudden enlargement
and sudden contraction). The governing equation of motion for this system is derived
by using beam theory. Three types of end pipe supports (flexible, simply and rigid)
were adopted to investigate their effects on the vibration characteristics. Also, the
effect of some design parameters like pipe diameter, length, pipe material, and the
effect of fluid velocity were investigated.
Two different pipe systems of different diameters were investigated, model-1
[12.7mm, 25.4mm, 12.7mm] and model-2 [6.35mm, 12.7mm, 6.35mm] with length
[0.25m, 0.5m, 0.25m] and model-3 with same diameter for model-1 but with length
[0.5m, 0.5m, 0.5m]. Three pipe materials were tried, copper, steel and aluminum. The
effect of Reynolds number between (500 - 1500) was also investigated. The dynamic
behavior of a pipe conveying fluid is described by means of transfer matrix method. A
Matlab- R2007 language computer program has been developed in this study to predict
the vibration response.
The results of Matlab program were compared with those from ANSYS-11
program and it is found that there is a good agreement between them.
Keywords
)
