The simultaneous effects of image force and diffusion on ultrafine particle deposition onto vegetation

A wind tunnel study

Ming-Yeng Lin, Cheng Wei Huang, Gabriel Katul, Chia Ren Chu, Andrey Khlystov

Research output: Contribution to journalArticle

Abstract

Atmospheric ultrafine particles (UFP) and their associated sources and sinks continue to attract significant research attention in climate and air pollution science. Vegetation is an important sink for UFP given its large area coverage. What remains a subject of inquiry are the aerodynamic and electromagnetic processes governing the aforementioned vegetation sink. Single fiber theory can explain deposition of zero charged UFP onto vegetation by treating vegetation as filter media. However, the ability of single fiber theory to predict deposition of charged UFP onto vegetation remains to be explored and frames the scope here. Wind tunnel experiments were used to investigate UFP dry deposition onto Juniper branches (Juniperus chinesis) under three different wind speeds (0.3, 0.6, and 0.9 m/s). Results indicate that the single fiber theory can describe the deposition of singly charged particles onto vegetation if both the image force and Brownian diffusion are simultaneously considered. The image force can be expressed by 24.5√K IM when the image force dimensionless number (K IM ) is smaller than 10 −8 . It is shown that the single fiber filtration model and the wind tunnel measurements mostly agree to within 20%. The main finding here is that the image force at smaller K IM (10 −10 ∼ 10 −8 ) increases deposition of charged UFP onto vegetation. Because filtration theory can be readily accommodated in fluid transport formulations as a boundary condition, the findings regarding charge enhance UFP deposition schemes that can be used in air quality and climate models.

Original languageEnglish
Pages (from-to)371-380
Number of pages10
JournalAerosol Science and Technology
Volume53
Issue number4
DOIs
Publication statusPublished - 2019 Apr 3

Fingerprint

wind tunnel
Wind tunnels
Charged particles
vegetation
Fibers
dimensionless number
Climate models
atmospheric particle
dry deposition
effect
particle
Ultrafine
Air pollution
Air quality
aerodynamics
climate modeling
Aerodynamics
air quality
atmospheric pollution
boundary condition

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

Cite this

Lin, Ming-Yeng ; Huang, Cheng Wei ; Katul, Gabriel ; Chu, Chia Ren ; Khlystov, Andrey. / The simultaneous effects of image force and diffusion on ultrafine particle deposition onto vegetation : A wind tunnel study. In: Aerosol Science and Technology. 2019 ; Vol. 53, No. 4. pp. 371-380.
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The simultaneous effects of image force and diffusion on ultrafine particle deposition onto vegetation : A wind tunnel study. / Lin, Ming-Yeng; Huang, Cheng Wei; Katul, Gabriel; Chu, Chia Ren; Khlystov, Andrey.

In: Aerosol Science and Technology, Vol. 53, No. 4, 03.04.2019, p. 371-380.

Research output: Contribution to journalArticle

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