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Heat and mass transfer models to understand the drying mechanisms of a porous substrate

  • Joel SongokEmail author
  • Douglas W. Bousfield
  • Patrick A.C. Gane
  • Martti Toivakka
Regular Article
Part of the following topical collections:
  1. Wetting and Drying: Physics and Pattern Formation

Abstract.

While drying of paper and paper coatings is expensive, with significant energy requirements, the rate controlling mechanisms are not currently fully understood. Two two-dimensional models are used as a first approximation to predict the heat transfer during hot air drying and to evaluate the role of various parameters on the drying rates of porous coatings. The models help determine the structural limiting factors during the drying process, while applying for the first time the recently known values of coating thermal diffusivity. The results indicate that the thermal conductivity of the coating structure is not the controlling factor, but the drying rate is rather determined by the thermal transfer process at the structure surface. This underlines the need for ensuring an efficient thermal transfer from hot air to coating surface during drying, before considering further measures to increase the thermal conductivity of porous coatings.

Graphical abstract

Keywords

Topical Issue: Wetting and Drying: Physics and Pattern Formation 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Joel Songok
    • 1
    Email author
  • Douglas W. Bousfield
    • 2
  • Patrick A.C. Gane
    • 3
    • 4
  • Martti Toivakka
    • 1
  1. 1.Laboratory of Paper Coating and Converting and Center for Functional MaterialsAbo Akademi UniversityÅbo/TurkuFinland
  2. 2.Department of Chemical and Biological EngineeringUniversity of MaineOronoUSA
  3. 3.School of Chemical Technology, Department of Forest Products TechnologyAalto UniversityAaltoFinland
  4. 4.Omya International AGOftringenSwitzerland

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