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Experimental determination and modeling of equilibrium moisture content from the sapwood of Mexican pine (Pinus pseudostrobus Lindl.)

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Forestry Studies in China 2011年第4期13卷 285-289页

作者： Juan RODRIGUEZ-RAMIREZ sadoth sandoval-torres Lilia MENDEZ-LAGUNAS Artemio Carrillo PARRA Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional (CIIDIR) Oaxaca Instituto Politécnico Nacional Oaxaca 71230 Mexico Facultad de Ciencias Forestales Universidad Autónoma de Nuevo León Linares Nuevo León 67700 Mexico

A desorption isotherm is a very important basis in the understanding of drying process. In this study, the desorption isotherms from the sapwood of Mexican pine （Pinus pseudostrobus Lindl.） were determined by the gravimetric method （discontinuous control of sample weight） at 30℃ and 50℃. The salt method was used in the range of water activities from 0.11 to 0.89. The results show that the desorption ability of Mexican pine sapwood increased with temperature at a given relative humidity. The experimental data was further simulated with the models, i.e., BET, GAB, Oswin and Henderson models. The GAB, Oswin and Henderson models allow the representation of the entire desorption isotherms. The BET model showed a better fit for water activity lower than 0.35, with a mean relative deviation of 0.0286 at 30℃ and 0.0167 at 50℃. Simultaneously, the BET model gave a better representation of moisture content in the monolayer saturation region. Overall, the GAB model ensured the best simulation of the entire isotherm, while the Henderson model displayed the worst simulation.

关键词： modeling isotherms Mexican pine sapwood

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Causes of color changes in wood during drying

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Forestry Studies in China 2010年第4期12卷 167-175页

作者： sadoth sandoval-torres Wahbi JOMAA Francoise MARC J-R PUIGGALI Université Bordeaux 1 Laboratoire TREFLE site ENSAMEsplanade Arts et Métiers CEDEX Instituto Politécnico Nacional CIIDIR Oaxaca EngineeringHornos 1003Col.Noche Buena.Santa Cruz Xoxocotlán

The forest industry operates in a dynamic and global market where change and competition are the rule rather than the exception. The color of wood is one of the most attractive features for the modem wood industry. Even when wood is chosen for its structural qualities, attractive and decorative colors are usually an important factor. In many applications, particularly in furniture, decorative products, decorative veneers and flooring, accurate matching of the color of different samples is required. Wood attributes and properties are important because they have a direct bearing on market opportunities and consumer acceptance for many types of manufactured wood products. The aim of this review is to identify causes of wood discoloration and advances in drying technology to overcome this problem. Wood discoloration is a complex phenomenon, mainly affected by heat, light, physiological and biochemical reactions, as well as from attack by microorganisms.

关键词： wood discoloration wood chemistry drying

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Differences of Wood Elements of Prosopis laevigata from Two Areas of Northeast Mexico

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American Journal of Plant Sciences 2013年第5期4卷 56-60页

作者： Artemio Carrillo-Parra Rahim Foroughbakhch-Pournavab Verónica Bustamante-García sadoth sandoval-torres Fortunato Garza-Ocanas Sergio Moreno-Limón Facultad de Ciencias Forestales Universidad Untónoma de Nuevo LeónLinaresMéxico Facultad de Ciencias Biológicas Uni-versidad Uutónoma de Nuevo LeónSan Nicolás de los GarzaMéxico Instituto de Silvicultura e Industria de la Madera Universi-dad Juárez del Estado de DurangoDurangoMéxico Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional Instituto Politécnico NacionalOaxaca de JuárezMéxico

Anatomical features of wood have a great variation among species as a result of genetic and environmental factors. The anatomical heartwood characteristics of Prosopis laevigata species from two areas with differences on temperature and rain precipitation on northeast Mexico were compared. Fibers length (μm), diameter of vessels (μm), and the area of the vessels (μm-2) were measured using light microscopy coupled with a digitized-image analysis system. The differences were statistically analyzed with analysis of variance. Statistical differences between fibers length (p 0.0001) and diameter of the vessels (p 0.001) from the two localities were found. The locality Linares, Nuevo León, Mexico, with higher precipitation and lower temperature, showed higher fiber length and higher diameter of the vessels than China, Nuevo León. Hard environmental conditions, where low precipitation values and high temperatures prevail, condition P. laevigata trees do reduce the risk of losing water.

关键词： Wood Anatomy Prosopis laevigata Vessels Fiber

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3D Model Simulating the Hydro-mechanical State of Unsaturated and Deformable Material during Hot air Drying

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Hydro Science & Marine Engineering 2020年第1期2卷 27-32页

作者： Lamine Hassini sadoth sandoval torres University of Tunis El Manar Facultédes Sciences de TunisLaboratoire d’Energétique et des Transferts Thermique et Massique(LETTM)Tunisia Instituto Politécnico Nacional CIIDIR unidad OaxacaHornos No.1003Col.Noche BuenaSanta Cruz XoxocotlánOaxacaMexico Department of Physics College of Science and Humanities in AlGuayah-Shaqra UniversitySaudi Arabia

A three dimensional model to predict the hydro-mechanical state of unsaturated and deformable material during hot air drying has been *** material viscoelastic behaviour was formulated using Bishop’s effective stress theory for partially saturated material using the liquid saturation as the Bishop *** hydro-thermal and mechanical equations were coupled by the fluid pressure and the solid matter *** model was applied to a deformable material(innovative clay-cellulose fibers composite)subjected to convective drying.A generalized Maxwell model with five elements,whose parameters were measured experimentally and correlated to water content was used to describe the material’s viscoelastic *** hydro-thermal part of the proposed model was validated on the basis of a comparison of experimental and simulated drying rate *** Von Mises stress was simulated and compared to the experimental tensile strength in order to predict the time and the region of material *** a drying process at 95°C,the region of failure risk was *** failure may occur on the lateral surface of the slab in contact with air at a drying time of 2.5h.

关键词： Modeling and simulation Cellulosic-clay composite Convective drying Von Mises stress Material failure

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