Computational modelling of heat and mass transfer during the high-temperature heat treatment of wood

Younsi, R.; Kocaefe, Duygu; Poncsák, Sándor; Kocaefe, Yasar S.

doi:10.1016/j.applthermaleng.2006.10.025

Cited by 44 publications

(39 citation statements)

References 15 publications

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“…Los fundamentos de la transferencia de materia y energía involucrados en el proceso de fijación se explican en Smith (1991), Siau (1984), Özisik (1985), Levenspiel (1987), McCabe et al (1999), Nijdam et al (2000), Gu y Zink-Sharp (2005), Jarl-Gunnar (2011), Younsi et al (2007), Glass y Zelinka (2010).…”

Section: Universidad Del Bío -Bíounclassified

“…Para el análisis de la influencia de las condiciones de climatización sobre las probetas representadas en la figura 1, se planteó el balance de energía de cada una. El mismo se presenta en la ecuación 17, (Siau 1984, Özisik 1985, Younsi et al 2007). …”

Section: Universidad Del Bío -Bíounclassified

“…Las las condiciones de contorno se presentan en las ecuaciones 18 y 19, (Siau 1984, Özisik 1985, Younsi et al 2007):…”

Section: Figura 2 Condiciones De Contorno Durante El Proceso De Climunclassified

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Fijación química del preservante CCA-C en la madera de Pinus elliottii Parte 2: Cinética y modelización

Wottitz

Moreno

2013

Maderas, Cienc. tecnol.

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RESUMENEn este trabajo se analiza la cinética química global del proceso de fijación del CCA en la madera de Pinus elliottii y se modeliza la evolución del proceso de fijación en función del tiempo a diferentes combinaciones de temperatura y humedad relativa. Para ello se utilizaron probetas cúbicas de 2 cm de arista, se impregnaron me-diante un proceso vacío-presión con solución de CCA-C al 2 % en masa y se trataron en cámara climatizadora según nueve combinaciones de temperatura y humedad relativa durante siete días. La evaluación del proceso de fijación se llevó a cabo mediante la determinación por espectrofotometría UV-Vis de la concentración de Cr (VI) lixiviado del aserrín de la madera tratada con agua desmineralizada. La velocidad del proceso principal de fijación del CCA está controlada principalmente por la velocidad de las reacciones químicas involucradas. Se obtuvo una ecuación confiable de la ley de velocidad de la etapa principal del proceso de fijación del CCA en la madera, la cual involucra a las condiciones de climatización y el tiempo de exposición. Palabras claves:Pinus elliottii, preservantes CCA, fijación, cinética, modelización. ABSTRACTThis paper analyzes the global chemical kinetics of CCA fixation process in the wood of Pinus elliottii and models the evolution of the process of setting function of time at different combinations of temperature and relative humidity. For this purpose, 2 cm cub specimens were impregnated by a vacuum-pressure process with CCA C solution (2% by mass) and were treated in climatic chamber according to nine combinations of temperature and relative humidity for seven days. The fixing process evaluation was carried out by means of the determination by UV-Vis spectrophotometry, the concentration of Cr (VI) leaching from treated wood sawdust with demineralized water. The main process speed CCA fixation is mainly controlled by the speed of the chemical reactions involved. An equation reliable rate law of the main stage of the process of CCA fixation on wood, which involves climate conditions and exposure time.

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Section: Universidad Del Bío -Bíounclassified

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Fijación química del preservante CCA-C en la madera de Pinus elliottii Parte 2: Cinética y modelización

Wottitz

Moreno

2013

Maderas, Cienc. tecnol.

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“…Only a few studies have considered the variable mass transfer coefficient, such as [24], who studied the drying of wood, and [23], who studied the leaves drying.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a concentrated parameters mathematical model applied to drying of yerba mate leaves with variable mass transfer coefficient

Pilatti

Johann

Palú

et al. 2016

Applied Thermal Engineering

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“…Modeling the exchange processes at the interface between a free flow and a flow in a porous medium appears in a wide range of applications from food processing [1], wood or paper production [2], salinization of agricultural land [3], prediction of convective heat and moisture transfer at exterior building surfaces [4], to the study of the mass and energy exchanges at the interface between a nuclear waste disposal and the ventilation galleries [5,6]. This latter is the main focus of this paper in terms of application.…”

Section: Introductionmentioning

confidence: 99%

A domain decomposition method to couple nonisothermal compositional gas liquid Darcy and free gas flows

Birgle

Masson

Trenty

2018

Journal of Computational Physics

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A domain decomposition algorithm is introduced to couple nonisothermal compositional gas liquid Darcy and free gas flow and transport. At each time step, our algorithm solves iteratively the nonlinear system coupling the nonisothermal compositional Darcy flow in the porous medium, the RANS gas flow in the free-flow domain, and the transport of the species and of energy in the free-flow domain. In order to speed up the convergence of the algorithm, the transmission conditions at the interface are replaced by Robin type boundary conditions. The Robin coefficients are obtained from a diagonal approximation of the Dirichlet to Neumann operator related to a simplified model in the neighbouring subdomain. The efficiency of our domain decomposition algorithm is assessed on several test cases focusing on the modeling of the mass and energy exchanges at the interface between the geological formation and the ventilation galleries of geological radioactive waste disposal.

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Computational modelling of heat and mass transfer during the high-temperature heat treatment of wood

Cited by 44 publications

References 15 publications

Fijación química del preservante CCA-C en la madera de Pinus elliottii Parte 2: Cinética y modelización

Fijación química del preservante CCA-C en la madera de Pinus elliottii Parte 2: Cinética y modelización

Evaluation of a concentrated parameters mathematical model applied to drying of yerba mate leaves with variable mass transfer coefficient

A domain decomposition method to couple nonisothermal compositional gas liquid Darcy and free gas flows

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