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A model for through-drying of tissue paper at constant pressure drop and high drying intensity

Weineisen, Henrik LU and Stenström, Stig LU (2007) In Drying Technology 25(12). p.1949-1958
Abstract
A mathematical model for through drying of paper at constant pressure drop was developed. The model is based on physical properties; hence, basis weight, pressure drop, drying air temperature, pore size distribution, initial gas fraction, and tortuosity are important input parameters to the model. The model was solved for different combinations of the variables basis weight, drying air temperature, and pressure drop corresponding to industrial conditions and the results were compared with data from bench-scale experiments. The simulations show that the drying rate curve is very sensitive to the air flow rate and that correctly modeling the correlation between pressure drop and air flow rate is the most important factor for a successful... (More)
A mathematical model for through drying of paper at constant pressure drop was developed. The model is based on physical properties; hence, basis weight, pressure drop, drying air temperature, pore size distribution, initial gas fraction, and tortuosity are important input parameters to the model. The model was solved for different combinations of the variables basis weight, drying air temperature, and pressure drop corresponding to industrial conditions and the results were compared with data from bench-scale experiments. The simulations show that the drying rate curve is very sensitive to the air flow rate and that correctly modeling the correlation between pressure drop and air flow rate is the most important factor for a successful model for through drying. The model was tuned by adjusting the parameters initial gas fraction and tortuosity in order to give the best possible fit to experimental data. For a given basis weight and pressure drop, different drying air temperatures resulted in relatively constant values of the fitted parameters. This means that the model can well predict the effects of changes in drying air temperature based on a tuning of the model performed at the same basis weight and pressure drop. However, for a given basis weight, an increase in pressure drop yielded fitted parameters that were somewhat different; i.e., a lower initial gas fraction and a higher tortuosity, a change that increases the resistance to air flow. This implies that the correlation between pressure drop and air flow rate in the model does not quite capture the nonlinear relationship shown by the experiments. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Modeling, TAD, Through air drying, Through drying, Tissue
in
Drying Technology
volume
25
issue
12
pages
1949 - 1958
publisher
TAPPI
external identifiers
  • wos:000253875600006
  • scopus:36849047364
ISSN
1532-2300
DOI
10.1080/07373930701727259
language
English
LU publication?
yes
id
e3846c5d-d0d1-4da7-944d-80835a1afc33 (old id 702160)
date added to LUP
2008-01-09 12:06:57
date last changed
2017-02-19 03:33:31
@article{e3846c5d-d0d1-4da7-944d-80835a1afc33,
  abstract     = {A mathematical model for through drying of paper at constant pressure drop was developed. The model is based on physical properties; hence, basis weight, pressure drop, drying air temperature, pore size distribution, initial gas fraction, and tortuosity are important input parameters to the model. The model was solved for different combinations of the variables basis weight, drying air temperature, and pressure drop corresponding to industrial conditions and the results were compared with data from bench-scale experiments. The simulations show that the drying rate curve is very sensitive to the air flow rate and that correctly modeling the correlation between pressure drop and air flow rate is the most important factor for a successful model for through drying. The model was tuned by adjusting the parameters initial gas fraction and tortuosity in order to give the best possible fit to experimental data. For a given basis weight and pressure drop, different drying air temperatures resulted in relatively constant values of the fitted parameters. This means that the model can well predict the effects of changes in drying air temperature based on a tuning of the model performed at the same basis weight and pressure drop. However, for a given basis weight, an increase in pressure drop yielded fitted parameters that were somewhat different; i.e., a lower initial gas fraction and a higher tortuosity, a change that increases the resistance to air flow. This implies that the correlation between pressure drop and air flow rate in the model does not quite capture the nonlinear relationship shown by the experiments.},
  author       = {Weineisen, Henrik and Stenström, Stig},
  issn         = {1532-2300},
  keyword      = {Modeling,TAD,Through air drying,Through drying,Tissue},
  language     = {eng},
  number       = {12},
  pages        = {1949--1958},
  publisher    = {TAPPI},
  series       = {Drying Technology},
  title        = {A model for through-drying of tissue paper at constant pressure drop and high drying intensity},
  url          = {http://dx.doi.org/10.1080/07373930701727259},
  volume       = {25},
  year         = {2007},
}