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This article aims to analyse the global nonlocal dynamics of imperfect nanoscale fluidconveying nanotubes subject to pulsatile flow. The nanotubes are assumed to be viscoelastic. Utilising nonlocal strain gradient theory, Beskok-Karniadakis assumptions, Kelvin-Voigt scheme and Euler-Bernoulli theory, the coupled size-dependent equations are presented to account for the size effects for the nanoscale fluid and solid. Additionally, Coriolis and centrifugal accelerations, imperfection effects are considered in this article. Using different parameters, the response of the system is plotted and investigated. This investigation shows that the bifurcation response for transverse and longitudinal direction is highly dependent on the imperfection of nanotubes, the velocity and frequency of pulsatile flow. Moreover, varying different velocity components results in different responses. The preliminary results show that imperfections in fluid-conveying nanotubes reduce the chaos region.

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