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

Joel Songok*, Douglas W. Bousfield, Patrick A C Gane, Martti Toivakka

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    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: [Figure not available: see fulltext.]

    Original languageEnglish
    Article number25
    Number of pages8
    JournalEuropean Physical Journal E
    Volume39:25
    Issue number2
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Topical Issue: Wetting and Drying: Physics and Pattern Formation

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