A simple model of particle diffusivity in horizontal hydrotransport pipelines

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Abstract

An engineering model of the particle diffusivity in horizontal hydraulic conveying pipelines is developed. The model is based on a known equation of the turbulent diffusivity for isotropic turbulence. The Kolmogoroff turbulence model is employed. It is assumed that turbulence develops in an equivalent fluid, representing a solid-liquid suspension. The particle diffusivity model takes into account a diffusivity increase with both the particle size and the mean solids concentration. The model has two empirical parameters, which are identified from the experimental data available in the literature. A comparison of the computed solids concentration distributions over the pipe cross-section with those measured demonstrates a high model accuracy in a wide range of slurry flow parameters.

Original languageEnglish
Pages (from-to)84-94
Number of pages11
JournalChemical Engineering Science
Volume82
DOIs
Publication statusPublished - 12 Sep 2012
Externally publishedYes

Keywords

  • Diffusivity
  • Hydrotransport
  • Mathematical modeling
  • Particle
  • Slurries
  • Turbulence

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