Determination of moisture diffusivity in porous media using moisture concentration profiles

L. Pel, H.J.P. Brocken, K. Kopinga

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Abstract

A procedure is presented to determine the moisture diffusivity for drying from measured moisture concentration profiles. From error analysis it is shown that the applied space grid for scanning and the one-dimensional resolution of the NMR (nuclear magnetic resonance) method used for the measurements had a minor influence on the accuracy of the determination of the moisture diffusivity. The inaccuracy was dominated by experimental noise and inhomogeneities in the porosity of the materials under investigation. A receding drying front method is presented to determine the moisture diffusivity at low moisture contents: here the moisture transport is dominated by vapour transport, which limits the overall drying rate. The method uses the velocity of the receding drying front to approximate the moisture diffusivity.
Original languageEnglish
Pages (from-to)1273-1280
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Volume39
Issue number6
DOIs
Publication statusPublished - 1996

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