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Article
2017

Application of the dissipation theorem to turbulent flow and mass transfer in a pipe


John NewmanJohn Newman
Russian Journal of Electrochemistry
https://doi.org/10.1134/S1023193517100093
Abstract / Full Text

The dissipation theorem is applied to turbulent pipe flow. The eddy-viscosity profiles can be made to agree with some in the literature in the sense that the eddy viscosity starts at zero on the solid pipe wall, rises to a maximum, and declines again toward the center line. A relationship between the volumetric dissipation and the eddy viscosity is derived by means of an energy balance on a core of fluid of radius r. The question of what exponent to use on the radius in another governing equation is clarified, thereby giving better agreement with experimental data than other values tried. Negative values of the eddy viscosity can be obtained in some regions of the flow field, such as near the center line, and it is suggested that these can be eliminated by slight modification of the decay term. Better agreement with the shapes of friction-factor and mass-transfer curves could be achieved by further (empirical) modification of the stress dependence of parameters in the model.

Author information
  • Department of Chemical and Biomolecular Engineering, University of California, Berkeley, 94720-1462, California, USAJohn Newman
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