Particle boundary layer above and downstream of an area source

Scaling, simulations, and pollen transport

Marcelo Chamecki, Charles Meneveau

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Dispersion of small particles emitted from an area source at the surface into a fully developed high-Reynolds-number boundary layer flow is studied as a theoretical model for pollen dispersion in the neutral atmospheric boundary layer. The particle plume above the area source is assumed to behave as a particle concentration boundary layer. Boundary layer scaling and the assumption of self-preservation lead to an analytical solution in the form of a similarity function that has an additional dependence on the ratio of gravitational settling and turbulent diffusion velocities. Similar arguments are used to predict patterns of deposition onto the surface downstream of the source. Theoretical predictions are tested using a suite of large-eddy-simulation numerical experiments, with good agreement. The combined analysis of theoretical and numerical results reveals interesting features in the patterns of downstream deposition, such as non-monotonic trends in isolation distance with particle settling velocity and surprisingly large isolation distances for practically relevant parameter ranges. Possible effects of turbulence on effective settling velocity are highlighted.

Original languageEnglish (US)
Pages (from-to)1-26
Number of pages26
JournalJournal of Fluid Mechanics
Volume683
DOIs
StatePublished - Sep 25 2011

Fingerprint

pollen
boundary layers
Boundary layers
settling
scaling
Atmospheric boundary layer
isolation
simulation
Boundary layer flow
Large eddy simulation
atmospheric boundary layer
turbulent diffusion
boundary layer flow
high Reynolds number
Reynolds number
Turbulence
large eddy simulation
plumes
turbulence
trends

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "Dispersion of small particles emitted from an area source at the surface into a fully developed high-Reynolds-number boundary layer flow is studied as a theoretical model for pollen dispersion in the neutral atmospheric boundary layer. The particle plume above the area source is assumed to behave as a particle concentration boundary layer. Boundary layer scaling and the assumption of self-preservation lead to an analytical solution in the form of a similarity function that has an additional dependence on the ratio of gravitational settling and turbulent diffusion velocities. Similar arguments are used to predict patterns of deposition onto the surface downstream of the source. Theoretical predictions are tested using a suite of large-eddy-simulation numerical experiments, with good agreement. The combined analysis of theoretical and numerical results reveals interesting features in the patterns of downstream deposition, such as non-monotonic trends in isolation distance with particle settling velocity and surprisingly large isolation distances for practically relevant parameter ranges. Possible effects of turbulence on effective settling velocity are highlighted.",
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Particle boundary layer above and downstream of an area source : Scaling, simulations, and pollen transport. / Chamecki, Marcelo; Meneveau, Charles.

In: Journal of Fluid Mechanics, Vol. 683, 25.09.2011, p. 1-26.

Research output: Contribution to journalArticle

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