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  • Modeling of unsteady friction and viscoelastic damping in piping systems [Elektronski vir]
    Landry, C. ...
    In real systems, the phenomena, such as pipe-wall viscoelasticity, unsteady friction or fluid structure interaction induce additional damping and dispersion of transient pressure waves than that ... defined by classical water hammer. In this paper, unsteady friction models and viscoelastic damping models will be presented and a theoretical formulation of the viscoelastic damping in piping systems without cavitation will be developed. Firstly, the friction factor will be presented as the sum of the quasi-steady part and the unsteady part related to the instantaneous local acceleration and instantaneous convective acceleration. This unsteady friction model has been incorporated into the method of characteristic algorithm (MOC). Secondly, the damping will be defined in terms of viscoelastic effect attributed to a second viscosity [micro]'. This model is solved using the Finite Difference Method. Finally, numerical results from the unsteady friction and viscoelastic models are compared with results of laboratory measurements for waterhammer cases with low Reynolds number turbulent flows. This comparison validates the new viscoelastic model.
    Vir: 26th IAHR Symposium on Hydraulic Machinery and Systems, August 19-23, 2012, Tsinghua University, Beijing, China [Elektronski vir] (Vol. 15, pt. 5, 2012, str. [1-9])
    Vrsta gradiva - prispevek na konferenci
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 12487963

    Povezava(-e):

    http://iopscience.iop.org/article/10.1088/1755-1315/15/5/052030/meta
    DOI

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