A high-temperature thermal treatment of wood using a multiscale computational model: Application to wood poles

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

doi:10.1016/j.biortech.2010.01.089

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…We are taken the value 10 -5 [12]. * Coefficient of diffusion of the bound water in the wood (m 2 /s) in the dimension 1 [13]:…”

Section: *Fiber Saturation Pointsmentioning

confidence: 99%

Numerical Study of Heat and Mass Transfer during the Thermal Drying of Tropical Woods

2014

(IJTEE)

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A sector of utilization and transformation of wood give much money at the countries of the central Africa region. If we want to increase these advantages, it is important to do locally the first and second transformations of wood. Self-control of the wood drying is necessary to ameliorate a wood quality and to preserve an art work doing in wood. In this article, we are modeling a drying of one piece of bete wood (Mansonia altissima) with dimensions are 1m of length and thickness is no more than 25cm. We have used a literature to obtain a mass and heat equations and the thermophysical properties of the present wood. We have considered some thermophysical properties that we are unkempt in the precedent work [1]. We have experimentally obtained a relationship between a density of this wood with a water content. The others thermophysical properties come from the literature [1,2]. We have simulated a wood drying in the constant conditions and in the conditions of the bete drying table established by CIRAD Organization. A sensibility study is doing to validate a modeling. Then, the present modeling explains temperature, mass fraction of the vapor in air and water content evolutions during the industrial process of drying. This modeling can to be used for to overhaul a drying table of bete wood and the others of tropical woods. This work uses a gaseous pressure can be used to explain the drying with the high temperatures conditions.

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“…We are taken the value 10 -5 [12]. * Coefficient of diffusion of the bound water in the wood (m 2 /s) in the dimension 1 [13]:…”

Section: *Fiber Saturation Pointsmentioning

confidence: 99%

Numerical Study of Heat and Mass Transfer during the Thermal Drying of Tropical Woods

2014

(IJTEE)

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“…The theory of transport phenomena in porous materials can be found in several investigations [27][28][29][30][31]. Younsi and coworkers showed the necessity of solving Navier-Stokes equations in the surroundings of the wood sample in order to get more information about the boundary conditions for the transport equations in the medium and then solve the complete thermal problem [25,32,33]. In order to analyze the conjugate problem of heat and moisture transport in wood, the authors used the classical Luikov model [28] for the numerical formulation of the problem in wood part [34,35].…”

Section: Introductionmentioning

confidence: 99%

“…These predominant mechanisms depend not only on the internal physical properties and hygroscopic nature of wood; but also on external conditions of temperature, fluid humidity and flow, and the way that heat is supplied during the treatment [22,23]. Some authors have numerically considered the problem of thermal treatment of wood at high temperature as a conjugate simultaneous heat and mass transfer through porous medium [7,[24][25][26]. The theory of transport phenomena in porous materials can be found in several investigations [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Some investigations on moisture injection, moisture diffusivity and thermal conductivity using a three-dimensional computation of wood heat treatment at high temperature

Oumarou

Kocaefe

2015

International Communications in Heat and Mass Transfer

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“…In the 1990s and 2000s, a substantial amount of mathematical developments have been proposed to describe the transport of a solute undergoing biodegradation in porous media, the growth of biofilms and the momentum transport 22–24 . Nowadays, the physics of transport in porous media is widely recognized as extremely complex as it deals with multiscale heterogeneities 25 . One of the challenges in the development of models for the transport of biodegradable solutes in porous media containing biofilm are the multiscale of the phenomenon (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Bioclogging effects on mass transport using volume averaging method in bioretention cell treating wastewater: Theories

Li,

Wang,

Jin

2024

Env Prog and Sustain Energy

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In bioretention cell (BRC) systems, internal clogging in the hydraulic field caused by microbial organisms growing in the nonuniform porous media can lead to the reduction of denitrification capacity. To investigate microbial effect processes, a multispecies biological field‐hydraulic coupling transport model in BRC was developed based on the average volume method (AVM) and traditional convection‐diffusion–reaction equation. This model provides a method to establish a connection between the microscale biofilm thickness and the macroscale measurement of pollutant concentration, which has been less frequently discussed in previous research. The present work differs from earlier works by explicitly smoothing the diversity and complexity of media structure by upscaling the physical quantities using the AVM. The results suggest that the model is derived for enhancing a more comprehensive understanding the relationship between the microscopic biofilm thickness and the measured concentration. It is also found that the infiltration description is required adding porosity parameter in order to have an accurate simulation of permeable phenomena under biologically growing condition.

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A high-temperature thermal treatment of wood using a multiscale computational model: Application to wood poles

Cited by 10 publications

References 22 publications

Numerical Study of Heat and Mass Transfer during the Thermal Drying of Tropical Woods

Numerical Study of Heat and Mass Transfer during the Thermal Drying of Tropical Woods

Some investigations on moisture injection, moisture diffusivity and thermal conductivity using a three-dimensional computation of wood heat treatment at high temperature

Bioclogging effects on mass transport using volume averaging method in bioretention cell treating wastewater: Theories

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