Top

Wood Science and Technology

Published in:

06-04-2017 | Original

Thermally limited wood moisture changes: relevance for dynamic vapour sorption experiments

Author: Wim Willems

Published in: Wood Science and Technology | Issue 4/2017

Activate our intelligent search to find suitable subject content or patents.

search-config

AI-assisted search

Off

Abstract

In this research, an analytical model is developed for the study of thermal effects on transient uptake of moisture by wood exposed to a stepwise relative humidity (RH) change. This model specifically addresses the effect of the latent heat injection (withdrawal) during adsorption (desorption) on the equilibrium wood moisture content. It is explained that this inherent effect associated with wood moisture changes dominates at high RH in slow kinetic processes having time constants up to a few hundred minutes in 20 mg wood samples. In this dynamic range, the predicted RH dependence of the time constant is confirmed by dynamic vapour sorption experiments.

previous article Reversible and irreversible dimensional changes of heat-treated wood during alternate wetting and drying

next article Effect of supercritical CO2 dewatering followed by oven-drying of softwood and hardwood timbers

Dont have a licence yet? Then find out more about our products and how to get one now:

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

über 67.000 Bücher
über 390 Zeitschriften

aus folgenden Fachgebieten:

Automobil + Motoren
Bauwesen + Immobilien
Business IT + Informatik
Elektrotechnik + Elektronik
Energie + Nachhaltigkeit
Maschinenbau + Werkstoffe

Jetzt Wissensvorsprung sichern!

inform now

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

über 102.000 Bücher
über 537 Zeitschriften

aus folgenden Fachgebieten:

Automobil + Motoren
Bauwesen + Immobilien
Business IT + Informatik
Elektrotechnik + Elektronik
Energie + Nachhaltigkeit
Finance + Banking
Management + Führung
Marketing + Vertrieb
Maschinenbau + Werkstoffe
Versicherung + Risiko

Jetzt Wissensvorsprung sichern!

inform now

Available only for authorised users

Absetz I, Koponen S, Lehtinen M (1993) Effects of cell and cell wall structure on mechanical and moisture physical properties of wood. Annual report, Helsinki University of Technology, Laboratory of Structural Engineering and Building Physics

Altgen M, Hofmann T, Militz H (2016) Wood moisture content during the thermal modification process affects the improvement in hygroscopicity of Scots pine sapwood. Wood Sci Technol 50:1181–1195CrossRef

Ananias RA, Mougel E, Zoulalian A (2009) Introducing an overall mass transfer coefficient for predicting of drying curves at low-temperature drying rates. Wood Sci Technol 43:43–56CrossRef

Bergman TL, Lavine AS, Incropera FP, DeWitt DP (2011) Fundamentals of heat and mass transfer, 7th edn. Wiley, New York

Bertinetti L, Fratzl P, Zemp T (2016) Chemical, colloidal and mechanical contributions to the state of water in wood cell walls. New J Phys 18:083048CrossRef

Choong ET, Fogg PJ (1968) Moisture movement in six wood species. Forest Prod J 18:66–70

Christensen GN, Hergt HFA (1969) Effect of previous history on kinetics of sorption by wood cell wall. Polym Sci A1(7):2427–2430CrossRef

Christensen GN, Kelsey KE (1959) Die Geschwindigkeit der Wasserdampfsorption durch Holz (The rate of sorption of water vapor by wood) (In German). Holz Roh Werkst 17:178–188CrossRef

Crank J (1975) The mathematics of diffusion, 2nd edn. Oxford University Press, New York

De Kee D, Liu Q, Hinestroza J (2005) Viscoelastic (non-Fickian) diffusion. Can J Chem Eng 83:913–929CrossRef

Engelund ET, Klamer M, Venås TM (2010) Acquisition of sorption isotherms for modified woods by the use of dynamic vapour sorption instrumentation. Principles and Practice. In: The international research group on wood protection, document no IRG/WP 10-40518, Stockholm

Engelund ET, Thygesen LG, Svensson S, Hill CAS (2013) A critical discussion of the physics of wood–water interactions. Wood Sci Technol 47:141–161CrossRef

Glass SV, Boardman CR, Zelinka SL (2016) Short hold times in dynamic vapor sorption measurements mischaracterize the equilibrium moisture content of wood. Wood Sci Technol 51(2):243–260CrossRef

González-Penã MM, Breese MC, Hale MDC (2005) Studies on the relaxation of heat-treated wood. In: Militz H, Hill C (eds) Wood modification: processes properties and commercialization. Georg August University Press, Göttingen, pp 87–90

Hill CAS (2006) Wood modification—chemical, thermal and other processes. Wiley, ChichesterCrossRef

Hill CAS, Norton A, Newman G (2010) Analysis of the water vapour sorption behaviour of Sitka spruce (Picea sitchensis (Bongard) Carr.) based on the parallel exponential kinetics model. Holzforschung 64:469–473

Hill CAS, Keating BA, Jalaludin Z, Mahrdt E (2012) A rheological description of the water vapour sorption kinetics behaviour of wood invoking a model using a canonical assembly of Kelvin–Voigt elements and a possible link with sorption hysteresis. Holzforschung 66:35–47CrossRef

Himmel S, Mai C (2016) Water vapour sorption of wood modified by acetylation and formalisation – analysed by a sorption kinetics model and thermodynamic considerations. Holzforschung 70:203–213CrossRef

Jalaludin Z (2012) The water vapour sorption behaviour of wood. Dissertation, Bangor University

Kelly MW, Hart CA (1970) Water vapor sorption rates by wood cell walls. Wood Fiber Sci 1:270–282

Kohler R, Renate D, Bernhard A, Rainer A (2003) A numeric model for the kinetics of water vapour sorption on cellulosic reinforcement fibers. Compos Interfaces 10:255–257CrossRef

Krabbenhøft K, Damskilde L (2004) A model for non-Fickian moisture transfer in wood. Mat Struct 37:615–622CrossRef

Liu JY (1989) A new method for separating diffusion coefficient and surface emission coefficient. Wood Fiber Sci 21:133–141

Olek W, Perré P, Weres J (2011) Implementation of a relaxation equilibrium term in the convective boundary condition for a better representation of the transient bound water diffusion in wood. Wood Sci Technol 45:677–691CrossRef

Olek W, Rémond R, Weres J, Perré P (2016) Non-Fickian moisture diffusion in thermally modified beech wood analyzed by the inverse method. Int J Therm Sci 109:291–298CrossRef

Popescu CM, Hill CAS, Curling S, Ormondroyd G, Xie Y (2014) The water vapour sorption behaviour of acetylated birch wood: how acetylation affects the sorption isotherm and accessible hydroxyl content. J Mater Sci 49:2362–2371CrossRef

Simpson WT (1974) Measuring dependence of diffusion coefficient of wood on moisture concentration by adsorption experiments. Wood Fiber Sci 5:299–307

Skaar C (1988) Wood-water relations. Springer, BerlinCrossRef

Trechsel HR, Bomberg MT (2009) Moisture control in buildings: the key factor in mold prevention, 2nd edn. ASTM International, West Conshohocken

Wadsö L (1994) Unsteady-state water vapor adsorption in wood: an experimental study. Wood Fiber Sci 26:36–50

Willems W (2014a) Hydrostatic pressure and temperature dependence of wood moisture sorption isotherms. Wood Sci Technol 48:483–498CrossRef

Willems W (2014b) The water vapor sorption mechanism and its hysteresis in wood: the water/void mixture postulate. Wood Sci Technol 48:499–518CrossRef

Xie YJ, Hill CAS, Jalaludin Z, Curling SF, Anandjiwala RD, Norton AJ, Newman G (2011) The dynamic water vapour sorption behaviour of natural fibres and kinetic analysis using the parallel exponential kinetics model. J Mater Sci 46:479–489CrossRef

Zaihan J, Hill CAS, Curling S, Hashim WS, Hamdan H (2010) The kinetics of water vapour sorption: analysis using parallel exponential kinetics model on six Malaysian hardwoods. J Trop For Sci 22:107–117

Title: Thermally limited wood moisture changes: relevance for dynamic vapour sorption experiments
Author: Wim Willems
Publication date: 06-04-2017
Publisher: Springer Berlin Heidelberg
Published in: Wood Science and Technology / Issue 4/2017
Print ISSN: 0043-7719
Electronic ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-017-0905-x

Springer Professional

Abstract

Please log in to get access to your license.

Dont have a licence yet? Then find out more about our products and how to get one now:

Springer Professional "Technik"

Springer Professional "Wirtschaft+Technik"

Other articles of this Issue 4/2017

Effect of temperature on electrical conductivity of green sapwood of Pinus radiata (radiata pine)

Hydroalcoholic extracts from the bark of Quercus suber L. (Cork): optimization of extraction conditions, chemical composition and antioxidant potential

Review: Comparative analysis of CO2 laser and conventional sawing for cutting of lumber and wood-based materials

Effect of supercritical CO2 dewatering followed by oven-drying of softwood and hardwood timbers

Conversion of various types of lignocellulosic biomass to fermentable sugars using kraft pulping and enzymatic hydrolysis

Artificial neural network and SIMCA classification in some wood discrimination based on near-infrared spectra