Abstract
The aim of this study is to investigate the laminar fluid hammer phenomenon in viscoelastic fluids through a straight pipe. To pursue this aim, the finite-volume method is adopted to numerically assess the influences of the viscoelastic non-dimensional parameters on the viscoelastic fluid hammer in an axisymmetric pipe. Herein, the Phan–Thien–Tanner model is selected as the constitutive equation, which could be used to study the viscosity ratio, Deborah number, and the extensibility parameter simultaneously. The results are in good agreement with the experimental data and analytical solution. The impacts of the viscosity ratio, the Deborah number, and the extensibility parameter in constant Reynolds number on the pressure history, velocity profile, and wall shear stress history are investigated. Present results reveal that increasing viscosity ratio and decreasing the Deborah number lead to a shorter attenuation time; however, the viscosity ratio has a more profound effect compared with the Deborah number. The extensibility parameter has not any impact on the viscoelastic fluid hammer virtually. Moreover, lower viscosity ratios create stronger reversed flows. Finally, although increasing the viscosity ratio and decreasing the Deborah number provide a larger damping ratio in the wall shear stress history, these create larger wall shear stress in the earlier peaks.
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Badami, M.M., Riasi, A. & Sadeghy, K. Numerical analysis of laminar viscoelastic fluid hammer phenomenon in an axisymmetric pipe. J Braz. Soc. Mech. Sci. Eng. 43, 396 (2021). https://doi.org/10.1007/s40430-021-03113-2
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DOI: https://doi.org/10.1007/s40430-021-03113-2