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Water vapor sorption and diffusivity in bark

Holmberg, André LU ; Wadsö, Lars LU and Stenström, Stig LU (2016) In Drying Technology 34(2). p.150-160
Abstract
Physical properties of importance in drying processes have been compiled for bark, including spruce, pine, and birch in Sweden. Water vapor sorption isotherms were determined for the bark of these trees. At 95% relative humidity and 25 degrees C, outer birch bark reached a moisture ratio (kg water/kg dry mass) of 5%, whereas inner birch bark, spruce bark, and pine bark reached moisture ratios of 21, 28, and 25%, respectively. The transverse water vapor diffusivity in samples of spruce bark, pine bark, inner birch bark, and outer birch bark were determined to be 1.1-1.710(-6), 2.2-9.210(-7), 1.5-2.610(-6), and 4.3-1310(-8)m(2)/s, respectively. The in-plane diffusivity was of the same magnitude as the transverse diffusivity in inner birch... (More)
Physical properties of importance in drying processes have been compiled for bark, including spruce, pine, and birch in Sweden. Water vapor sorption isotherms were determined for the bark of these trees. At 95% relative humidity and 25 degrees C, outer birch bark reached a moisture ratio (kg water/kg dry mass) of 5%, whereas inner birch bark, spruce bark, and pine bark reached moisture ratios of 21, 28, and 25%, respectively. The transverse water vapor diffusivity in samples of spruce bark, pine bark, inner birch bark, and outer birch bark were determined to be 1.1-1.710(-6), 2.2-9.210(-7), 1.5-2.610(-6), and 4.3-1310(-8)m(2)/s, respectively. The in-plane diffusivity was of the same magnitude as the transverse diffusivity in inner birch bark, whereas in outer birch bark the in-plane diffusivity was several times higher than the transverse diffusivity. These data can be used to model the drying behavior and can thus aid in the design of efficient bark drying processes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bark, drying, physical properties, sorption isotherms, vapor diffusion
in
Drying Technology
volume
34
issue
2
pages
150 - 160
publisher
TAPPI
external identifiers
  • wos:000365895200002
  • scopus:84949324090
ISSN
1532-2300
DOI
10.1080/07373937.2015.1023310
language
English
LU publication?
yes
id
f25112ce-46e3-4e4f-b114-9b5baf027fd6 (old id 8556923)
date added to LUP
2016-01-26 14:30:22
date last changed
2017-08-13 03:23:56
@article{f25112ce-46e3-4e4f-b114-9b5baf027fd6,
  abstract     = {Physical properties of importance in drying processes have been compiled for bark, including spruce, pine, and birch in Sweden. Water vapor sorption isotherms were determined for the bark of these trees. At 95% relative humidity and 25 degrees C, outer birch bark reached a moisture ratio (kg water/kg dry mass) of 5%, whereas inner birch bark, spruce bark, and pine bark reached moisture ratios of 21, 28, and 25%, respectively. The transverse water vapor diffusivity in samples of spruce bark, pine bark, inner birch bark, and outer birch bark were determined to be 1.1-1.710(-6), 2.2-9.210(-7), 1.5-2.610(-6), and 4.3-1310(-8)m(2)/s, respectively. The in-plane diffusivity was of the same magnitude as the transverse diffusivity in inner birch bark, whereas in outer birch bark the in-plane diffusivity was several times higher than the transverse diffusivity. These data can be used to model the drying behavior and can thus aid in the design of efficient bark drying processes.},
  author       = {Holmberg, André and Wadsö, Lars and Stenström, Stig},
  issn         = {1532-2300},
  keyword      = {Bark,drying,physical properties,sorption isotherms,vapor diffusion},
  language     = {eng},
  number       = {2},
  pages        = {150--160},
  publisher    = {TAPPI},
  series       = {Drying Technology},
  title        = {Water vapor sorption and diffusivity in bark},
  url          = {http://dx.doi.org/10.1080/07373937.2015.1023310},
  volume       = {34},
  year         = {2016},
}