On the viscoelastic dynamics of fluid-conveying microtubes

Ghayesh, Mergen and Farokhi, Hamed (2018) On the viscoelastic dynamics of fluid-conveying microtubes. International Journal of Engineering Science, 127. pp. 186-200. ISSN 0020-7225

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Abstract

This paper is the first to analyse the coupled fluid-structure viscoelastic dynamical characteristics of a fluid-conveying viscoelastic microtube resting on a nonlinear elastic bed subject to large rotations. None of the axial and transverse motions/accelerations is neglected in the modelling and simulations. The dissipation is modelled using the Kelvin–Voigt scheme for the deviatoric segment of the symmetric couple stress tensor and the stress tensor. Based on the Euler–Bernoulli theory, in which the microtube cross-section remains perpendicular to the centreline, and the modified couple stress theory (MCST), the energies and the work of external load and damping are formulated. Through use of Hamilton's principle, the coupled transverse-longitudinal equations governing the motion of the fluid-conveying viscoelastic microtube are developed. A weighted-residual-based discretisation method is applied to the continuous vibration model and the resultant reduced model is simulated via a continuation technique. The coupled fluid-structure dynamical characteristics of the fluid-conveying viscoelastic microtube are analysed by constructing the frequency-amplitude diagrams. It is shown that slight changes in the flow speed significantly affects the resonant response and modal interactions.

Item Type:	Article
Uncontrolled Keywords:	Fluid-conveying, Viscoelastic microtube, Small size effect, Elastic bed, Kelvin–Voigt
Subjects:	H300 Mechanical Engineering
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Becky Skoyles
Date Deposited:	08 Aug 2018 08:54
Last Modified:	10 Oct 2019 16:30
URI:	http://nrl.northumbria.ac.uk/id/eprint/35215

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