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Multiphase transport model of swelling cellulose based materials with variable hydrophobicity.

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Title: Multiphase transport model of swelling cellulose based materials with variable hydrophobicity.
Authors: Alexandersson, M.1 (AUTHOR) marcus.alexandersson@solid.lth.se, Ristinmaa, M.1 (AUTHOR) matti.ristinmaa@solid.lth.se
Source: International Journal of Engineering Science. Aug2019, Vol. 141, p112-140. 29p.
Subjects: Cellulose fibers, Cellulose, Water vapor, Boundary value problems, Multiphase flow, Ideal gases
Abstract: A thermodynamically consistent model for multiphase flow in swelling cellulose based material is adopted. The material is decomposed into a fiber phase, a gas phase and an inter-fiber water phase, where the fiber phase consists of a fiber water and a dry fiber constituent and the gas phase is an ideal gas mixture of water vapor and dry air. The model is derived within mixture theory and includes local non-equilibrium mass exchange between inter-fiber water, fiber water and water vapor. From assumptions on the microscale structure a novel model is derived to account for spatially varying hydrophobicity. An finite element implementation is made and employed to solve boundary value problems for edge wicking to investigate the water transport in paperboard with varying hydrophobicity. The results are analysed with the aim to better understand the mechanisms of interaction between water and fiber/cellulose. Simulations with spatially varying hydrophobicity reveals different regimes of the macroscopic water uptake made accessible by the decomposition of the water into inter-fiber water and fiber water contributions. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Engineering Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 136935301
AccessLevel: 6
PubType: Periodical
PubTypeId: serialPeriodical
PreciseRelevancyScore: 0
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  Data: Multiphase transport model of swelling cellulose based materials with variable hydrophobicity.
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  Data: <searchLink fieldCode="AR" term="%22Alexandersson%2C+M%2E%22">Alexandersson, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> marcus.alexandersson@solid.lth.se</i><br /><searchLink fieldCode="AR" term="%22Ristinmaa%2C+M%2E%22">Ristinmaa, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> matti.ristinmaa@solid.lth.se</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Engineering+Science%22">International Journal of Engineering Science</searchLink>. Aug2019, Vol. 141, p112-140. 29p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Cellulose+fibers%22">Cellulose fibers</searchLink><br /><searchLink fieldCode="DE" term="%22Cellulose%22">Cellulose</searchLink><br /><searchLink fieldCode="DE" term="%22Water+vapor%22">Water vapor</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+value+problems%22">Boundary value problems</searchLink><br /><searchLink fieldCode="DE" term="%22Multiphase+flow%22">Multiphase flow</searchLink><br /><searchLink fieldCode="DE" term="%22Ideal+gases%22">Ideal gases</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A thermodynamically consistent model for multiphase flow in swelling cellulose based material is adopted. The material is decomposed into a fiber phase, a gas phase and an inter-fiber water phase, where the fiber phase consists of a fiber water and a dry fiber constituent and the gas phase is an ideal gas mixture of water vapor and dry air. The model is derived within mixture theory and includes local non-equilibrium mass exchange between inter-fiber water, fiber water and water vapor. From assumptions on the microscale structure a novel model is derived to account for spatially varying hydrophobicity. An finite element implementation is made and employed to solve boundary value problems for edge wicking to investigate the water transport in paperboard with varying hydrophobicity. The results are analysed with the aim to better understand the mechanisms of interaction between water and fiber/cellulose. Simulations with spatially varying hydrophobicity reveals different regimes of the macroscopic water uptake made accessible by the decomposition of the water into inter-fiber water and fiber water contributions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Engineering Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.ijengsci.2019.05.010
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 29
        StartPage: 112
    Subjects:
      – SubjectFull: Cellulose fibers
        Type: general
      – SubjectFull: Cellulose
        Type: general
      – SubjectFull: Water vapor
        Type: general
      – SubjectFull: Boundary value problems
        Type: general
      – SubjectFull: Multiphase flow
        Type: general
      – SubjectFull: Ideal gases
        Type: general
    Titles:
      – TitleFull: Multiphase transport model of swelling cellulose based materials with variable hydrophobicity.
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            NameFull: Ristinmaa, M.
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          Dates:
            – D: 01
              M: 08
              Text: Aug2019
              Type: published
              Y: 2019
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              Value: 00207225
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              Value: 141
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            – TitleFull: International Journal of Engineering Science
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