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Mechanisms responsible for sub-micron particle deposition in a laminar wall jet

Göransson, Anders LU and Trägårdh, Christian LU (2002) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 211(2-3). p.133-144
Abstract
An experimental study was performed to investigate the dependency of particle size on the deposition rate. Polystyrene latex particles of two radii (0.23 and 0.38 mum) were deposited onto a glass surface covered with indium-tin oxide. Reduced deposition efficiency was observed for the larger particles, although an increase in the deposition efficiency was seen as that the diffusion boundary layer became thicker. A critical degree of surface coverage, Brit, was defined as the fraction of surface coverage at which the linear variation of flux with time ended. When the two particle sizes were compared, it was found that the value of Brit depended only on the wall shear stress. This result indicates that surface shielding is an important... (More)
An experimental study was performed to investigate the dependency of particle size on the deposition rate. Polystyrene latex particles of two radii (0.23 and 0.38 mum) were deposited onto a glass surface covered with indium-tin oxide. Reduced deposition efficiency was observed for the larger particles, although an increase in the deposition efficiency was seen as that the diffusion boundary layer became thicker. A critical degree of surface coverage, Brit, was defined as the fraction of surface coverage at which the linear variation of flux with time ended. When the two particle sizes were compared, it was found that the value of Brit depended only on the wall shear stress. This result indicates that surface shielding is an important factor in the decline in particle flux. The deposition process was divided into two separate processes, described by a mass-transfer coefficient and an adhesion rate coefficient. It was found that the process was governed by mass-transfer during the initial period, but for higher degrees of surface coverage adhesion became the rate-determining factor. (C) 2002 Elsevier Science B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
deposition efficiency, wall-jet, particle deposition, shielding
in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
211
issue
2-3
pages
133 - 144
publisher
Elsevier
external identifiers
  • wos:000179710100004
  • scopus:0037015939
ISSN
0927-7757
DOI
10.1016/S0927-7757(02)00259-5
language
English
LU publication?
yes
id
88a475ab-888b-4f9c-9c03-1d259e99f25a (old id 321797)
date added to LUP
2007-08-20 16:49:37
date last changed
2017-01-01 06:57:53
@article{88a475ab-888b-4f9c-9c03-1d259e99f25a,
  abstract     = {An experimental study was performed to investigate the dependency of particle size on the deposition rate. Polystyrene latex particles of two radii (0.23 and 0.38 mum) were deposited onto a glass surface covered with indium-tin oxide. Reduced deposition efficiency was observed for the larger particles, although an increase in the deposition efficiency was seen as that the diffusion boundary layer became thicker. A critical degree of surface coverage, Brit, was defined as the fraction of surface coverage at which the linear variation of flux with time ended. When the two particle sizes were compared, it was found that the value of Brit depended only on the wall shear stress. This result indicates that surface shielding is an important factor in the decline in particle flux. The deposition process was divided into two separate processes, described by a mass-transfer coefficient and an adhesion rate coefficient. It was found that the process was governed by mass-transfer during the initial period, but for higher degrees of surface coverage adhesion became the rate-determining factor. (C) 2002 Elsevier Science B.V. All rights reserved.},
  author       = {Göransson, Anders and Trägårdh, Christian},
  issn         = {0927-7757},
  keyword      = {deposition efficiency,wall-jet,particle deposition,shielding},
  language     = {eng},
  number       = {2-3},
  pages        = {133--144},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {Mechanisms responsible for sub-micron particle deposition in a laminar wall jet},
  url          = {http://dx.doi.org/10.1016/S0927-7757(02)00259-5},
  volume       = {211},
  year         = {2002},
}