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

Research output: Contribution to journalArticleScientificpeer-review

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.
Original languageUndefined/Unknown
Pages (from-to)1–8
JournalEuropean Physical Journal E
Volume39
Issue number25
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • drying
  • porous materials
  • Mass transfer

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