Dynamics of Brownian particles in a turbulent channel flow

K. Fukagata, S. Zahrai, F. H. Bark

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11 Citations (Scopus)

Abstract

Turbulent channel flows with suspended particles are investigated by means of numerical simulations. The fluid velocity is computed by large eddy simulation. Motion of small graphite particles with diameter of 0.01-10 μm, corresponding to the Schmidt number, Sc, of 2.87 × 102-6.22 × 106 and the particle relaxation time in wall unit, τp+, of 9.79 × 10-5-4.51, is computed by Lagrangian particle tracking. Relation between the particle relaxation time and the computed deposition velocity is found to be in good agreement with an empirical relation. The statistics of the particle motion in the vicinity of the wall are studied. Clear differences are found in dynamical behavior of particles with different sizes. Medium size particles show a strong dependence on the structure of the fluid flow, while small and large particles are considerably less sensitive.

Original languageEnglish
Pages (from-to)715-726
Number of pages12
JournalHeat and Mass Transfer/Waerme- und Stoffuebertragung
Volume40
Issue number9
DOIs
Publication statusPublished - 2004 Jul
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

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