Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa

This study provides the sorption isotherm, its hysteresis and their mass transfer properties of four Central Africa Tropical woods widely used for building construction: frake (Terminalia superba), lotofa (Sterculia rhinopetala), sapele (Entandrophragma cylindricum) and ayous (Triplochiton scleroxyl...

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Autores principales:	Simo-Tagne,Merlin, Rémond,Romain, Rogaume,Yann, Zoulalian,André, Perré,Patrick
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2016
Materias:	Air permeability Central Africa diffusion coefficient sorption isotherm tropical woods
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2016000100020
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spelling	oai:scielo:S0718-221X20160001000202016-03-30Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, LotofaSimo-Tagne,MerlinRémond,RomainRogaume,YannZoulalian,AndréPerré,Patrick Air permeability Central Africa diffusion coefficient sorption isotherm tropical woods This study provides the sorption isotherm, its hysteresis and their mass transfer properties of four Central Africa Tropical woods widely used for building construction: frake (Terminalia superba), lotofa (Sterculia rhinopetala), sapele (Entandrophragma cylindricum) and ayous (Triplochiton scleroxylon). Characterization of these four species in particular and Central Africa tropical woods in general were necessary to develop conservation and treatment of wood after first transformation using the drying. Also, moisture transport on wooden material used such as wall buildings can be facilitating to found the thermal comfort. Measurements of isotherms were performed using a dynamic vapor sorption apparatus (Surface Measurement Systems) at 20 and 40°C with air relative humidity ranged from 0% to 90%. Mass diffusivity was determined in steady state using a specific vaporimeter. Air permeability was determined using a specialized device developed to measure over a wide range of permeability values. Permeability and mass transfer properties were determined in the tangential direction with a "false" quartersawn board (sapele and lotofa) and in the radial direction with a flatsawn board (ayous and frake). Samples of sapele, ayous and frake are heartwood when lotofa contains as well as heartwood than sapwood. Results obtained showed that the temperature effect on sorption behavior was quite low. We observed also a low difference between the sorption behavior of these different species and hysteresis of sorption decreases when temperature increases. Hailwood-Horrobin model´s explains plausibly the experimental sorption isotherms data. Results on characterization of mass transfer properties showed that, in the steady state, mass diffusivity decreases exponentially when basal density increases. Mass diffusivity was higher in desorption than in adsorption phase. The gaseous permeability of these species was between than those of Australian hardwoods and temperate woods. It was difficult to define a relationship between permeability and mass diffusivity.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.18 n.1 20162016-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2016000100020en10.4067/S0718-221X2016005000020
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Air permeability Central Africa diffusion coefficient sorption isotherm tropical woods
spellingShingle	Air permeability Central Africa diffusion coefficient sorption isotherm tropical woods Simo-Tagne,Merlin Rémond,Romain Rogaume,Yann Zoulalian,André Perré,Patrick Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa
description	This study provides the sorption isotherm, its hysteresis and their mass transfer properties of four Central Africa Tropical woods widely used for building construction: frake (Terminalia superba), lotofa (Sterculia rhinopetala), sapele (Entandrophragma cylindricum) and ayous (Triplochiton scleroxylon). Characterization of these four species in particular and Central Africa tropical woods in general were necessary to develop conservation and treatment of wood after first transformation using the drying. Also, moisture transport on wooden material used such as wall buildings can be facilitating to found the thermal comfort. Measurements of isotherms were performed using a dynamic vapor sorption apparatus (Surface Measurement Systems) at 20 and 40°C with air relative humidity ranged from 0% to 90%. Mass diffusivity was determined in steady state using a specific vaporimeter. Air permeability was determined using a specialized device developed to measure over a wide range of permeability values. Permeability and mass transfer properties were determined in the tangential direction with a "false" quartersawn board (sapele and lotofa) and in the radial direction with a flatsawn board (ayous and frake). Samples of sapele, ayous and frake are heartwood when lotofa contains as well as heartwood than sapwood. Results obtained showed that the temperature effect on sorption behavior was quite low. We observed also a low difference between the sorption behavior of these different species and hysteresis of sorption decreases when temperature increases. Hailwood-Horrobin model´s explains plausibly the experimental sorption isotherms data. Results on characterization of mass transfer properties showed that, in the steady state, mass diffusivity decreases exponentially when basal density increases. Mass diffusivity was higher in desorption than in adsorption phase. The gaseous permeability of these species was between than those of Australian hardwoods and temperate woods. It was difficult to define a relationship between permeability and mass diffusivity.
author	Simo-Tagne,Merlin Rémond,Romain Rogaume,Yann Zoulalian,André Perré,Patrick
author_facet	Simo-Tagne,Merlin Rémond,Romain Rogaume,Yann Zoulalian,André Perré,Patrick
author_sort	Simo-Tagne,Merlin
title	Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa
title_short	Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa
title_full	Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa
title_fullStr	Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa
title_full_unstemmed	Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa
title_sort	characterization of sorption behavior and mass transfer properties of four central africa tropical woods: ayous, sapele, frake, lotofa
publisher	Universidad del Bío-Bío
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2016000100020
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Characterization of sorption behavior and mass transfer properties of four central africa tropical woods: Ayous, Sapele, Frake, Lotofa

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