Dynamics of Brownian particles in a turbulent channel flow

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

Research output: Contribution to journalArticle

10 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
Publication statusPublished - 2004 Jul
Externally publishedYes

Fingerprint

channel flow
Channel flow
Relaxation time
Graphite
Large eddy simulation
Flow of fluids
Particle size
Statistics
Fluids
Computer simulation
relaxation time
Schmidt number
particle motion
large eddy simulation
fluid flow
graphite
statistics
fluids

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this

Dynamics of Brownian particles in a turbulent channel flow. / Fukagata, Koji; Zahrai, S.; Bark, F. H.

In: Heat and Mass Transfer/Waerme- und Stoffuebertragung, Vol. 40, No. 9, 07.2004, p. 715-726.

Research output: Contribution to journalArticle

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