Internal mass transfer coefficient during drying of softwood (Pinus elliottii Engelm.) boards

Rozas, Carlos; Tomaselli, Ivan; Zanoelo, Éverton Fernando

doi:10.1007/s00226-008-0223-4

Cited by 8 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This conclusion coincides with previous research by Almeida et al (2007) and Rozas et al (2009), who claim that a region can exist in drying wood where the loss of bound water occurs when liquid (free) water is still available.…”

Section: Discussionsupporting

confidence: 92%

“…The temperature changes of boards of 50×200×500 mm size were measured following the general practice of examining lumbers of approximately 20 to 50 mm thickness, e.g., Awoyemi and Jones (2010); Gonzalez-Pena and Hale (2010); Ohmae and Makano (2009);Pang (2002);and Rozas et al (2009). The boards were hung in a furnace and were irradiated without interruption for at least 200 min.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

et al. 2013

View full text Add to dashboard Cite

This article reports the results of temperature measurements carried out on 50-mm-thick Norway spruce (Picea abies [L.] Karst) wood samples exposed to infrared (IR) radiation. The varied property with respect to the optimization of the drying technology was the initial moisture content of samples. During the experiments, temperature profiles were registered on the surface and in the core of the samples under controlled technological conditions. Based on our osmotic approach, the variability in the curves was interpreted with respect to the stagnation temperature below the fiber saturation point (FSP). We conclude that the amount of liquid water necessary for osmosis must still be available locally in the core. With decreasing initial average moisture content, the time interval of the osmotic process also decreases. In this context our results support the hypothesis that the presence of free water in the wood tissue is necessary for the osmotic mechanism even if the average moisture content falls below the FSP.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

et al. 2013

View full text Add to dashboard Cite

show abstract

“…there is a common model with only one variable for both forms of water (Jakiela et al, 2008;Rozas et al, 2009;Olek et al, 2011;Da Silva et al, 2011) or model with separated variables (Frandsen et al, 2007, Krabbenhoft 2003, 2004. .…”

Section: -Diffusion Modelmentioning

confidence: 99%

Numerical and experimental approaches to characterize the mass transfer process in wood elements

et al. 2017

View full text Add to dashboard Cite

The scope of this paper is an experimental characterization of diffusion parameters for wood material. Based on a nonlinear mass transfer algorithm, the present study focuses on the need to capture experimental moisture profiles in the sample, along with its evolution in weighting during both the desorption and adsorption phases, especially when the moisture content of the samples is far from the equilibrium state inducing a great gradient between heart and exchange surfaces of specimen. These moisture profiles are derived by means of a gammadensimetry laboratory method based on the water adsorption of gamma rays. The determination of the diffusion parameters obtained through optimizing a simulation by means of implementing the mass transfer kinetics into a finite difference method. Both the diffusion coefficient and convective exchange coefficient are deduced by considering a Nelder-Mead simplex inversion method. This work highlights the efficiency of the approach dedicated to uncoupling nonlinear diffusion in the cross-sections from boundary conditions in terms of convective

show abstract

“…Autores como Ananías et al, (2011), Dening et al (2000, Eriksson et al, (2007), Jankowsky et al (2003, Kneule (1981), Kollmann y Côté (1968), Meroney (1969), Rozas (2007), Rozas, Tomaselli e Zanoello (2009) y Simpson (1997) distinguen tres fases en la cinética de secado en la madera tomando como base al contenido de humedad. La primera fase, presenta una tasa constante de pérdida de humedad y se encuentra ausente en maderas latifoleadas.…”

unclassified

Estudio exploratorio para la caracterización de la tasa de secado de la madera de Eucalyptus nitens, aplicando modelos de regresión múltiple

Montero¹,

Rozas²

2019

Sci. For.

View full text Add to dashboard Cite

El objetivo de esta investigación fue proponer modelos para predecir la tasa de secado en madera de Eucalyptus nitens. Para esto, se utilizaron piezas tangenciales con espesor de 36 mm, un ancho 100 mm y un largo 1.000 mm, las cuales se sometieron a secado isotérmico en una cámara convectiva semi-industrial, controlando la masa a intervalos regulares de tiempo. Se utilizaron dos condiciones de secado; Condición 1 (temperatura bulbo seco/húmedo 40/35 ° C) y Condición 2 (55/50 ° C) y una velocidad del aire de 2 (m / s). Los resultados mostraron que las piezas de Eucalyptus nitens presentaron secado a tasa decrecientes, donde el contenido de humedad crítico fue el contenido de humedad inicial. El punto de saturación de la fibra experimental varió con la temperatura de secado, con error de hasta el 6,3% con respecto al valor teórico. La tasa de secado fue afectada de forma significativa por el contenido de humedad y la temperatura de bulbo seco. Finalmente los modelos de regresión simple y múltiple (valor-p: <0,001 y r 2 : 0,8623), fueron significativos y de alta capacidad de predicción para determinar la tasa de secado en piezas de Eucalyptus nitens.

show abstract

Internal mass transfer coefficient during drying of softwood (Pinus elliottii Engelm.) boards

Cited by 8 publications

References 17 publications

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

Numerical and experimental approaches to characterize the mass transfer process in wood elements

Estudio exploratorio para la caracterización de la tasa de secado de la madera de Eucalyptus nitens, aplicando modelos de regresión múltiple

Contact Info

Product

Resources

About