A model of turbulent drag reduction in a pipe is developed. The model employs a well-known two layer representation of the boundary layer structure. An approach of Yang and Dou (2010) to model the drag reduction effect, as a phenomenon caused by a non-Newtonian rheology of a viscous sublayer flow, is employed. The modified Prandtl–Karman equation for calculation of the friction factor in a pipe flow of a dilute polymer solution is derived. This equation contains the only empirical parameter that is a function of a polymer type and concentration. The results obtained using the model developed are in a good agreement with those calculated by the Yang and Dou (2010) model, verified against experimental data. An engineering model of a turbulent dilute polymer solution flow in a Couette device is also developed. The same approach to modeling drag reduction as that in a pipe flow is applied. The model allows to compute the dimensionless torque applied to the Couette device rotor as a function of the rotation speed for a given polymer type and concentration. Thus, the empirical parameter, characterizing drag reduction by using a certain polymer additive, can be identified from laboratory Couette device experiments requiring small fluid amounts, and then applied to forecast drag reduction in industrial-scale pipeline flows.


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    Titel :

    Applicability of a Taylor–Couette device to characterization of turbulent drag reduction in a pipeline


    Beteiligte:
    Eskin, Dmitry (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2014


    Format / Umfang :

    9 Seiten, 23 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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