Modeling of Sorption Isotherms of Various Kinds of Wood at Different Temperature Conditions

Krupińska, B.; Strømmen, Ingvald; Pakowski, Z.; Eikevik, Trygve Magne

doi:10.1080/07373930701537062

Cited by 54 publications

(37 citation statements)

References 15 publications

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“…In this work the general approaches of Sun and Woods [18] for wheat, Kaur et al [19] for tomato peel, Janjai et al [20] for logan, Basu et al [21] for xanthan gum, and Krupinska et al [22] for various kinds of wood were adopted and developed from the review of isotherm determination in Sun and Woods [23] for wheat and Basu et al [24,25] for foods. This involved fitting four well-established forms for the sorption model to the desorption data for kaffir lime leaves in order to establish the best fit.…”

Section: Drying Modelsmentioning

confidence: 99%

Kaffir Lime Leaf (Citrus hystricDC.) Drying Using Tray and Heat Pump Dehumidified Drying

Phoungchandang¹,

Srinukroh²,

Leenanon³

2008

Drying Technology

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Desorption isotherms of mature kaffir lime leaves are determined and a nonlinear regression program was applied to the experimental data to fit with any of the four moisture sorption isotherm models. It was found that the modified Halsey model could fit the best. Tray and heat pump-dehumidified drying of kaffir lime leaves were conducted and it was found that the modified Page model was the most effective one. The drying constant was fitted to drying air temperature using the Arrhenius model. Effective moisture diffusivities were determined using the drying data. Heat pump-dehumidified drying reduced drying time and provided dried kaffir lime leaves with higher amount of citronellal than tray drying.

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Section: Drying Modelsmentioning

confidence: 99%

Kaffir Lime Leaf (Citrus hystricDC.) Drying Using Tray and Heat Pump Dehumidified Drying

Phoungchandang¹,

Srinukroh²,

Leenanon³

2008

Drying Technology

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“…There are several models in the literature describing the moisture sorption isotherm; these models can be divided into several categories: kinetic models based on a monolayer (Mod-BET model), [14] kinetic models based on multilayer and condensed film (e.g., GAB model [17] ), semi-empirical (e.g., Ferro-Fontan, Henderson, and Halsey models [18][19][20] ), and empirical models. [21,22] The heat of adsorption is the heat that results when water vapor is adsorbed on a surface of the adsorbent; it is the energy required to break the intermolecular forces between water molecules and the adsorbent surface. [23,24] The net isosteric heat of sorption, or latent heat of vaporization, can be used as an indicator of the state of water adsorbed by the solid particles; it is also useful in estimating the energy requirements for drying process and in the designing of drying equipment.…”

Section: Impact Of Instant Controlled Pressure Drop Treatment On Moismentioning

confidence: 99%

Impact of Instant Controlled Pressure Drop Treatment on Moisture Adsorption Isotherm of Cork Granules

2009

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Some special thermal and mechanical treatments may completely modify the composition, and the structure of organic material changes its interaction with water. In the case of the instant controlled pressure drop (DIC) technique, the main modification, which is structure expansion and high porosity, allows the product to generally reduce moisture activity. In the special case of cork granules, the impact of DIC in terms of porosity is completely absent and expansion is linked to a tear effect obtained from only the large size granules. In order to characterize this type of treatment, we considered natural and DIC-treated cork granules and determined moisture adsorption isotherms at three different temperatures (25, 40, and 60 C) and different water activity levels ranging from 0.05 to 0.9 using the static gravimetric method. We used three samples of the same cork variety with 0.5-1 mm, 2-4 mm, and 4-6 mm as granule diameter. The adsorption isotherms of both natural untreated and DIC-treated cork whatever granules display a sigmoid form type II isotherm, with equilibrium moisture contents at constant water activity decreasing when temperature increases. The impact of DIC treatment depends of cork shape; the larger the shape, the lower the water activity for the same water content. Such a result is linked to the modification of structure. Thus, for the smallest shape, DIC implying only low thermal effect without any structure modification allows cork to lightly increase its water activity compared to the untreated samples. With higher shape cork granules, as DIC treatment induces a tear effect and some expansion, activity of water is lower for the same water content. For describing the experimental data of adsorption isotherms, we used GAB, BET, and Henderson models. We found the GAB to be the most suitable model with predicted values higher than those obtained using the BET model. We note that monolayer moisture content values increase in the case of big shape cork granules after having been treated by DIC.

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“…Equilibrium data for various wood samples have been presented. [12,13] This study aims at determining both drying kinetic and equilibrium data for the wood fibers studied. Kinetic drying curves were measured for spruce fibers at temperatures between 50 and 170 C and at different levels of relative humidity in equipment specially designed so that the weight change of the fiber samples could be measured and recorded during the drying process.…”

Section: Introductionmentioning

confidence: 99%

The Drying Kinetics and Equilibrium Moisture Content of MDF Fibers

2009

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An experimental device was constructed to study the drying kinetics of wood fibers under controlled conditions. The device consisted of a drying chamber in which a net basket filled with the fiber material was connected to a load cell. The drying medium was then forced through the basket at controlled levels of humidity and temperature.Experiments were performed with spruce fibers and the drying medium at varying temperature (50-170 C) and relative humidity (1-86%). In general, the drying rate increased with increasing temperature and decreasing relative humidity. A constant drying rate period was observed in all cases. The critical moisture content was approximately 1.25. The characteristic drying curve has a slight downward concave shape. The equilibrium moisture contents obtained at ambient temperature agree well with data in the literature.

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Modeling of Sorption Isotherms of Various Kinds of Wood at Different Temperature Conditions

Cited by 54 publications

References 15 publications

Kaffir Lime Leaf (Citrus hystricDC.) Drying Using Tray and Heat Pump Dehumidified Drying

Kaffir Lime Leaf (Citrus hystricDC.) Drying Using Tray and Heat Pump Dehumidified Drying

Impact of Instant Controlled Pressure Drop Treatment on Moisture Adsorption Isotherm of Cork Granules

The Drying Kinetics and Equilibrium Moisture Content of MDF Fibers

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