Dynamics of Brownian particles in a turbulent channel flow

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

doi:10.1007/s00231-003-0462-8

Dynamics of Brownian particles in a turbulent channel flow

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

Research output: Contribution to journal › Article › peer-review

12 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, τ_p⁺, 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 language	English
Pages (from-to)	715-726
Number of pages	12
Journal	Heat and Mass Transfer/Waerme- und Stoffuebertragung
Volume	40
Issue number	9
DOIs	https://doi.org/10.1007/s00231-003-0462-8
Publication status	Published - 2004 Jul
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Fluid Flow and Transfer Processes

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AU - Fukagata, K.

AU - Zahrai, S.

AU - Bark, F. H.

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AB - 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.

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Dynamics of Brownian particles in a turbulent channel flow

Abstract

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