Moisture transport in pine wood during one-sided heating studied by NMR

T. Arends; A.J. Barakat; L. Pel

doi:10.1016/j.expthermflusci.2018.08.004

Moisture transport in pine wood during one-sided heating studied by NMR

T. Arends
, A.J. Barakat
, L. Pel

Research output: Contribution to journal › Article › Academic › peer-review

19 Citations (Scopus)

170 Downloads (Pure)

Abstract

The quantification of moisture transport in heated wood is relevant to several fields, e.g. for lumber drying and processing and for fire safety risk assessment. We present non-destructive and simultaneous measurements of the moisture content and temperature distributions in pine wood during unilateral exposure to a heat source. The moisture content is measured by a nuclear magnetic resonance setup specifically built for the evaluation of moisture transport in porous materials at elevated temperatures. Temperature profiles are obtained by thermocouples placed at different distances from the exposed surface. While the temperature rises, a peak in the moisture content is formed, which travels towards the unexposed surface. The velocity of the moisture content peak depends on the principal direction in which transport occurs, as confirmed by experiments. Numerical simulations of moisture transport are performed which can qualitatively reproduce the behavior observed in experiments. Moreover, several characteristics, such as the timescale and non-linearity of the moisture peak position, are well captured. The influence of several input parameters, such as the permeability and diffusion coefficient, on the moisture peak dynamics is elaborately explored.

Original language	English
Pages (from-to)	259-271
Number of pages	13
Journal	Experimental Thermal and Fluid Science
Volume	99
DOIs	https://doi.org/10.1016/j.expthermflusci.2018.08.004
Publication status	Published - 1 Dec 2018

Funding

The research described in this paper has been carried out in the Darcy Center for porous media research and technology under project number M41.6.12464 in the framework of the Research Program of the Materials Innovation Institute (M2i) supported by the Dutch government. The authors would like to thank J.H.J. Dalderop and J.J. Noijen for their technical support, Theo Pijnenburg associated with “Ambachtelijke Modelmakerij Vorma” for the preparation of the samples used in this study, C.J. van Duijn for fruitful discussions, and Tata Steel, Almatis, and Kerneos for their support and collaboration on the mentioned project.

Keywords

Experimental study
Nuclear magnetic resonance
Numerical modelling
Transport visualization
Wood

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10.1016/j.expthermflusci.2018.08.004

published versionFinal published version, 1.6 MBLicence: TAVERNE

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title = "Moisture transport in pine wood during one-sided heating studied by NMR",

abstract = "The quantification of moisture transport in heated wood is relevant to several fields, e.g. for lumber drying and processing and for fire safety risk assessment. We present non-destructive and simultaneous measurements of the moisture content and temperature distributions in pine wood during unilateral exposure to a heat source. The moisture content is measured by a nuclear magnetic resonance setup specifically built for the evaluation of moisture transport in porous materials at elevated temperatures. Temperature profiles are obtained by thermocouples placed at different distances from the exposed surface. While the temperature rises, a peak in the moisture content is formed, which travels towards the unexposed surface. The velocity of the moisture content peak depends on the principal direction in which transport occurs, as confirmed by experiments. Numerical simulations of moisture transport are performed which can qualitatively reproduce the behavior observed in experiments. Moreover, several characteristics, such as the timescale and non-linearity of the moisture peak position, are well captured. The influence of several input parameters, such as the permeability and diffusion coefficient, on the moisture peak dynamics is elaborately explored.",

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AU - Arends, T.

AU - Barakat, A.J.

AU - Pel, L.

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N2 - The quantification of moisture transport in heated wood is relevant to several fields, e.g. for lumber drying and processing and for fire safety risk assessment. We present non-destructive and simultaneous measurements of the moisture content and temperature distributions in pine wood during unilateral exposure to a heat source. The moisture content is measured by a nuclear magnetic resonance setup specifically built for the evaluation of moisture transport in porous materials at elevated temperatures. Temperature profiles are obtained by thermocouples placed at different distances from the exposed surface. While the temperature rises, a peak in the moisture content is formed, which travels towards the unexposed surface. The velocity of the moisture content peak depends on the principal direction in which transport occurs, as confirmed by experiments. Numerical simulations of moisture transport are performed which can qualitatively reproduce the behavior observed in experiments. Moreover, several characteristics, such as the timescale and non-linearity of the moisture peak position, are well captured. The influence of several input parameters, such as the permeability and diffusion coefficient, on the moisture peak dynamics is elaborately explored.

AB - The quantification of moisture transport in heated wood is relevant to several fields, e.g. for lumber drying and processing and for fire safety risk assessment. We present non-destructive and simultaneous measurements of the moisture content and temperature distributions in pine wood during unilateral exposure to a heat source. The moisture content is measured by a nuclear magnetic resonance setup specifically built for the evaluation of moisture transport in porous materials at elevated temperatures. Temperature profiles are obtained by thermocouples placed at different distances from the exposed surface. While the temperature rises, a peak in the moisture content is formed, which travels towards the unexposed surface. The velocity of the moisture content peak depends on the principal direction in which transport occurs, as confirmed by experiments. Numerical simulations of moisture transport are performed which can qualitatively reproduce the behavior observed in experiments. Moreover, several characteristics, such as the timescale and non-linearity of the moisture peak position, are well captured. The influence of several input parameters, such as the permeability and diffusion coefficient, on the moisture peak dynamics is elaborately explored.

KW - Experimental study

KW - Nuclear magnetic resonance

KW - Numerical modelling

KW - Transport visualization

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ER -

Moisture transport in pine wood during one-sided heating studied by NMR

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Keywords

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