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Characterization of gas transport inside a package

Jonsson, Madeleine (2009)
Department of Energy Sciences
Abstract
A study of a sterilizing flow in a package is done. The study is done with the
commercial code Fluent using Large Eddy Simulation and validated with both
Laser Induced Fluorescence and Particle Image Velociometry.
The velocity field is examined in several ways; with changes in grid size, inlet
conditions and sub-grid scale models. The study showed that the most
important parameter is the size and form of the control volumes. A comparison
with the PIV data shows that the simulations have lower velocity in the lower
part of the package and more turbulent fluctuations in the whole package.
The concentration study is done with two different geometries, a larger with a
7 percent larger volume than the smaller. The grids of the two... (More)
A study of a sterilizing flow in a package is done. The study is done with the
commercial code Fluent using Large Eddy Simulation and validated with both
Laser Induced Fluorescence and Particle Image Velociometry.
The velocity field is examined in several ways; with changes in grid size, inlet
conditions and sub-grid scale models. The study showed that the most
important parameter is the size and form of the control volumes. A comparison
with the PIV data shows that the simulations have lower velocity in the lower
part of the package and more turbulent fluctuations in the whole package.
The concentration study is done with two different geometries, a larger with a
7 percent larger volume than the smaller. The grids of the two geometries
differs in the way that the small package has only hexahedral cell and the large
package also has some tetrahedral cells in the bottom. A comparison to LIF
data shows that the simulations of the small package match really well both in
the top and in the bottom of the package. The simulations of the large package
match well in the top but have a lower concentration level at the bottom. This
could be explained by the tetrahedral cells which generate more numerical
diffusion. A comparison between the large and the small package shows only a
small difference of concentration over time. (Less)
Please use this url to cite or link to this publication:
author
Jonsson, Madeleine
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
gas transport Large Eddy simulation laser induced fluorescence particle image velociometry
report number
ISRN LUTMDN/TMHP--09/5199--SE
ISSN
0282-1990
language
English
id
1549716
date added to LUP
2010-02-23 14:12:54
date last changed
2010-02-23 14:12:54
@misc{1549716,
  abstract     = {A study of a sterilizing flow in a package is done. The study is done with the
commercial code Fluent using Large Eddy Simulation and validated with both
Laser Induced Fluorescence and Particle Image Velociometry.
The velocity field is examined in several ways; with changes in grid size, inlet
conditions and sub-grid scale models. The study showed that the most
important parameter is the size and form of the control volumes. A comparison
with the PIV data shows that the simulations have lower velocity in the lower
part of the package and more turbulent fluctuations in the whole package.
The concentration study is done with two different geometries, a larger with a
7 percent larger volume than the smaller. The grids of the two geometries
differs in the way that the small package has only hexahedral cell and the large
package also has some tetrahedral cells in the bottom. A comparison to LIF
data shows that the simulations of the small package match really well both in
the top and in the bottom of the package. The simulations of the large package
match well in the top but have a lower concentration level at the bottom. This
could be explained by the tetrahedral cells which generate more numerical
diffusion. A comparison between the large and the small package shows only a
small difference of concentration over time.},
  author       = {Jonsson, Madeleine},
  issn         = {0282-1990},
  keyword      = {gas transport
Large Eddy simulation
laser induced fluorescence
particle image velociometry},
  language     = {eng},
  note         = {Student Paper},
  title        = {Characterization of gas transport inside a package},
  year         = {2009},
}