Wyznaczanie współczynnika dyfuzji wilgoci w drewnie jodły górskie

• Autorzy: Świrska-Perkowska J. , Jeż K.

Warianty tytułu

EN

Determination of the moisture diffusion coefficient in wood of sub-alpine fir

• Języki publikacji: PL

Abstrakty

EN

This work presents results of calculations of diffusion coefficient and surface emission coefficient for wood of sub-alpine fir (Abies lasiocarpa) in the case of diffusion in the transverse direction to fibres. The results of moisture desorption in the samples of sub-alpine fir, presented in the article by Cai [1] and realized by slicing samples and weighing individual slices, were employed in the work. The values of moisture diffusion coefficients and mass surface emission coefficient were found using the method of minimizing the fitting function, assuming boundary conditions of the second and third kind with constant surface emission coefficient on the corresponding edges of samples. Moreover, two cases of variations of the moisture diffusion coefficient together with moisture content of the material were analysed each time: in the form of a constant and quadratic function. The obtained results were compared with the results presented in the paper [1].

Słowa kluczowe

PL

wilgoć; jodła górska; współczynnik dyfuzji; minimalizacja funkcji błędu

EN

moisture; abies lasiocarpa; sub-alpine fir; diffusion coefficient; minimization of the error function

• Wydawca: Komisja Inżynierii Budowlanej Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Roczniki Inżynierii Budowlanej
• Rocznik: 2017
• Tom: z. 17
• Strony: 63--71
• Opis fizyczny: Bibliogr. 11 poz., rys., wykr.

Twórcy

autor

Świrska-Perkowska J.

• Politechnika Opolska, Wydział Budownictwa i Architektury, Opole, Polska

autor

Jeż K.

• Politechnika Opolska, Wydział Budownictwa i Architektury, Opole, Polska

Bibliografia

• [1] Cai, L.: Determination of diffusion coefficients for sub-alpine fir, Wood Science and Technology, 39 (2005), 153-162.
• [2] Čermák, P., Trcala, M.: Influence of uncertainly in diffusion coefficients on moisture field during wood drying, Int J Heat and Mass Transfer, 55 (2012), 7709-7717.
• [3] Danvind, J., Ekevad, M.: Local water vapour diffusion coefficient when drying Norway spruce sapwood, Journal of Wood Science, 52 (2006), 195-201.
• [4] Dvinskikh, S.V., Henrikssn, M., Mendicino, A.L., Fortino, S., Toratti, T.: NMR imaging study and multi-Fickian numerical simulation of moisture transfer in Norway spruce samples, Engineering Structures, 33 (2011), 3079-3086.
• [5] Eitelberger, J., Svensson, S.: The sorption behaviour of wood studies by means of an improved cup method, Transport in Porous Media, 92 (2012), 321-335.
• [6] Kang, W., Chung, W.Y., Eom, C., Yco, H.: Some considerations in heterogeneous nonisothermal transport models for wood: a numerical study, Journal of Wood Science 54 (2008), 267-277.
• [7] Olek, W., Perré, P., Weres, J.: Implementation of a relaxation equilibrium term in the convective boundary condition for a better representation of the transient bound water diffusion in wood, Wood Science and Technology, 45 (2011), 677-691.
• [8] Sargent, R,. Riley, S., Schöttle, L.: Measurement of dynamic sorption behaviour of small specimens of pinus radiata – influence of wood type and moisture content on diffusion rate, Maderas Ciencia y Tecnologia, 12, 1 (2010), 93-103.
• [9] Silva, W.P., Silva, L.D., Oliveira Farias, V.S., Silva, C.M.D.P.S., Ataíde, J.S.P.: Three-dimensional numerical analysis of water transfer in wood: determination of an expression for the effective mass diffusivity, Wood Science and Technology, 47 (2013), 897-912.
• [10] Silva, W.P., Silva, L.D., Silva, C.M.D.P.S., Nascimento, P.L.: Optimization and simulation of drying processes using diffusion models: application to wood drying using forced air at low temperature, Wood Science and Technology, 45 (2011), 787-800.
• [11] Świrska-Perkowska, J., Gajda, M.: Wyznaczanie współczynnika dyfuzji wilgoci w drewnie sosny zwyczajnej, Roczniki Inżynierii Budowlanej O/PAN Katowice, 15 (2015), 17-28.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).