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

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Joel Songok, Douglas W. Bousfield, Patrick A.C. Gane, Martti Toivakka
Publication year: 2016
Journal: European Physical Journal E
Journal acronym: Eur. Phys. J. E
Volume number: 39
Issue number: 25
Start page: 1
End page: 8
eISSN: 1292-895X


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.


Keywords

drying, Mass transfer, porous materials

Last updated on 2019-23-07 at 04:58