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

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10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalChemical Engineering Science
Volume116
DOIs
Publication statusPublished - 6 Sep 2014
Externally publishedYes

Keywords

  • Couette device
  • Drag reduction
  • Modeling
  • Pipe
  • Polymer
  • Turbulence

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