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Modelling of mass and heat transport in dryer fabric structures Part 1. Theoretical model

Smrtnik, Simon LU and Stenström, Stig LU (2009) In Nordic Pulp & Paper Research Journal 24(3). p.278-287
Abstract
The dryer fabric influences the mass and heat transfer, separating the hot, moist paper from the ambient drying air. A dynamic model is presented describing this mass and heat transfer in a dryer fabric based on the fabric parameters: effective diffusivity, porosity, tortuosity, calliper, effective permeability, thermal conductivity and basis weight. The model predicts moisture, temperature and pressure profiles. The results show that the mass transfer in the fabric is mainly diffusive and the heat transfer is mainly caused by the diffusive mass transfer. The mass transfer resistance of the fabric is strongly influenced by the effective diffusivity and the fabric calliper. The evaporation from the moist paper increased by 73% when the... (More)
The dryer fabric influences the mass and heat transfer, separating the hot, moist paper from the ambient drying air. A dynamic model is presented describing this mass and heat transfer in a dryer fabric based on the fabric parameters: effective diffusivity, porosity, tortuosity, calliper, effective permeability, thermal conductivity and basis weight. The model predicts moisture, temperature and pressure profiles. The results show that the mass transfer in the fabric is mainly diffusive and the heat transfer is mainly caused by the diffusive mass transfer. The mass transfer resistance of the fabric is strongly influenced by the effective diffusivity and the fabric calliper. The evaporation from the moist paper increased by 73% when the effective diffusivity was increased three times, compared with the reference case. When the fabric calliper was decreased to half, compared with the reference case, the evaporation increased by 30%. The effective permeability was, however, shown not to significantly influence the evaporation. Including the heat exchange of the dryer fabric in the model facilitates the calculation of condensation/evaporation phenomena in the fabric, such as those occurring in the Condebelt process. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heat, Mass transfer, Dryer fabric parameters, Dynamic modelling, Paper drying, transfer
in
Nordic Pulp & Paper Research Journal
volume
24
issue
3
pages
278 - 287
publisher
Arbor Publishing AB
external identifiers
  • wos:000270862100004
  • scopus:72749101211
ISSN
0283-2631
language
English
LU publication?
yes
id
e56411e0-4a93-4b88-93a8-8ec86b70afb7 (old id 1505993)
date added to LUP
2009-11-23 16:24:59
date last changed
2017-01-01 05:32:35
@article{e56411e0-4a93-4b88-93a8-8ec86b70afb7,
  abstract     = {The dryer fabric influences the mass and heat transfer, separating the hot, moist paper from the ambient drying air. A dynamic model is presented describing this mass and heat transfer in a dryer fabric based on the fabric parameters: effective diffusivity, porosity, tortuosity, calliper, effective permeability, thermal conductivity and basis weight. The model predicts moisture, temperature and pressure profiles. The results show that the mass transfer in the fabric is mainly diffusive and the heat transfer is mainly caused by the diffusive mass transfer. The mass transfer resistance of the fabric is strongly influenced by the effective diffusivity and the fabric calliper. The evaporation from the moist paper increased by 73% when the effective diffusivity was increased three times, compared with the reference case. When the fabric calliper was decreased to half, compared with the reference case, the evaporation increased by 30%. The effective permeability was, however, shown not to significantly influence the evaporation. Including the heat exchange of the dryer fabric in the model facilitates the calculation of condensation/evaporation phenomena in the fabric, such as those occurring in the Condebelt process.},
  author       = {Smrtnik, Simon and Stenström, Stig},
  issn         = {0283-2631},
  keyword      = {Heat,Mass transfer,Dryer fabric parameters,Dynamic modelling,Paper drying,transfer},
  language     = {eng},
  number       = {3},
  pages        = {278--287},
  publisher    = {Arbor Publishing AB},
  series       = {Nordic Pulp & Paper Research Journal},
  title        = {Modelling of mass and heat transport in dryer fabric structures Part 1. Theoretical model},
  volume       = {24},
  year         = {2009},
}