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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)

ISSN:2141-7016

Article Title: Analysis of the Dynamics of Offshore Fluid-Conveying Viscoelastic Pipes Resting on Deformable Sea Bed
by Sidikat I. Kuye

Abstract:
Recent analytical investigations revealed that the effect of variability of flow parameters especially at elevated temperatures can lead to instability, buckling and bursting of fluid-conveying systems. There is growing need to avoid pollution of the sea environment which is a major source of food supply. Proper consideration of the effects of the material properties of the conveyance medium in addition to the existing factors will go a long way to reduce the impacts of vibration. Viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. The problem of pre-stressed and pressurized viscoelastic pipe conveying a hot fluid is investigated in this paper. The viscoelastic pipe conveying a fluid is idealized as an elastic beam clamped at two ends resting on deformable sea bed is idealized as an elastic continuum. For this problem a linearized differential equation governing the problem in the transverse direction was obtained by employing Newtonian mechanics method for the vibrations analysis of the pipe taking into consideration other flow conditions. The governing partial differential equation obtained was solved using Fourier-Laplace method. Simulation that was carried out revealed the impacts of viscoelasticity, internal fluid velocity and other flow variables on the natural frequency and the response of the system. Results showed that natural frequency of viscoelastic pipe increases with mode, degree of viscoelasticity, and the fraction of pipe diameter buried while it decreases with fluid flow temperature. Further results showed that the response of the system decreases with mode, viscoelasticity and fraction of pipe diameter buried whereas it increases with fluid flow temperature. This paper has been able to demonstrate that pipe with high viscoelasticity will help to safeguard the environment by reducing pipe failure resulting from fluid flow-induced vibration.
Keywords: viscoelasticity, elevated temperature, deformable seabed, flow parameters, natural frequency.
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom

 

 

Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010