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Experimental evidence for evaporation/condensation nonuniform flow in a horizontal aerosol generator

Damour, T M; Ehrman, S H; Karlsson, Martin LU ; Karlsson, Lisa LU and Deppert, Knut LU (2005) In Aerosol Science and Technology 39(5). p.444-451
Abstract
The formation of deposition patterns in the cooling zone during operation of a horizontal evaporation/condensation nanoparticle generator was studied to obtain information about flow conditions during particle formation. Quartz reactor tubes were used together with a simple light attenuation measurement to characterize deposition as a function of axial location. Results for the onset and pattern of deposition for four different metals-indium, gallium, silver, and lead-were obtained, and size distributions for indium and gallium particle nanoparticles at different temperatures were measured. Distinct deposition bands could be observed resulting from vapor deposition, nanioparticle deposition, or a combination of both. The location or the... (More)
The formation of deposition patterns in the cooling zone during operation of a horizontal evaporation/condensation nanoparticle generator was studied to obtain information about flow conditions during particle formation. Quartz reactor tubes were used together with a simple light attenuation measurement to characterize deposition as a function of axial location. Results for the onset and pattern of deposition for four different metals-indium, gallium, silver, and lead-were obtained, and size distributions for indium and gallium particle nanoparticles at different temperatures were measured. Distinct deposition bands could be observed resulting from vapor deposition, nanioparticle deposition, or a combination of both. The location or the bands varied with metal and evaporation temperature. Experimentally observed fluctuations in temperature, bimodal size distributions obtained at the highest furnace temperatures, as well as asymmetric deposition patterns suggested the How in the cooling portion of the generator is nonuniform, possibly as a result of buoyancy. These results are important for the design of nanoparticle generation systems, in that horizontal evaporation/condensation generators are often chosen on the basis of assumed simplicity with respect to flow, and this may not always be the case. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Aerosol Science and Technology
volume
39
issue
5
pages
444 - 451
publisher
Taylor & Francis
external identifiers
  • wos:000229583300009
  • scopus:20044394563
ISSN
1521-7388
DOI
10.1080/027868290959834
language
English
LU publication?
yes
id
db8f7379-7c47-478d-ac0c-c9230661c37d (old id 238863)
date added to LUP
2007-08-10 11:29:11
date last changed
2017-04-09 03:30:07
@article{db8f7379-7c47-478d-ac0c-c9230661c37d,
  abstract     = {The formation of deposition patterns in the cooling zone during operation of a horizontal evaporation/condensation nanoparticle generator was studied to obtain information about flow conditions during particle formation. Quartz reactor tubes were used together with a simple light attenuation measurement to characterize deposition as a function of axial location. Results for the onset and pattern of deposition for four different metals-indium, gallium, silver, and lead-were obtained, and size distributions for indium and gallium particle nanoparticles at different temperatures were measured. Distinct deposition bands could be observed resulting from vapor deposition, nanioparticle deposition, or a combination of both. The location or the bands varied with metal and evaporation temperature. Experimentally observed fluctuations in temperature, bimodal size distributions obtained at the highest furnace temperatures, as well as asymmetric deposition patterns suggested the How in the cooling portion of the generator is nonuniform, possibly as a result of buoyancy. These results are important for the design of nanoparticle generation systems, in that horizontal evaporation/condensation generators are often chosen on the basis of assumed simplicity with respect to flow, and this may not always be the case.},
  author       = {Damour, T M and Ehrman, S H and Karlsson, Martin and Karlsson, Lisa and Deppert, Knut},
  issn         = {1521-7388},
  language     = {eng},
  number       = {5},
  pages        = {444--451},
  publisher    = {Taylor & Francis},
  series       = {Aerosol Science and Technology},
  title        = {Experimental evidence for evaporation/condensation nonuniform flow in a horizontal aerosol generator},
  url          = {http://dx.doi.org/10.1080/027868290959834},
  volume       = {39},
  year         = {2005},
}