Film flow in the water vapour permeability cup test
DOI:
https://doi.org/10.21809/rilemtechlett.2026.242Keywords:
Water vapour permeability, Sorption isotherm, Film flowAbstract
The Letter sets out the basis for including a contribution from liquid-water film flow to the so-called water vapour permeability [WVP] of porous inorganic materials. In this, the film thickness is derived from the water vapour sorption isotherm. A regression model is obtained for the dependence of the WVP resistance factor on the humidity. The model is tested against two published datasets. It is noted that available data are scarce, and that new precise measurements of the relation between the WVP and humidity are now required.
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Copyright (c) 2026 Christopher Hall
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Authors retain copyright of the articles published in RILEM Technical Letters and grant the journal the right of first publication with open access. The work is simultaneously licensed under Creative Commons Attribution 4.0 International License (CC BY 4.0) that allows others to share and adapt the work under the following terms: 1) a proper attribution is given in a form of bibliographic record with the DOI link directing to RILEM Technical Letters; 2) a link to the license is provided; 3) the changes (if any) are indicated.
