BLERON, Laurent

Denaud, Louis Etienne

Dupleix, Anna

KUSIAK, Andrzej

Marchal, Remy

ROSSI, Frederic

English

Archive Ouverte en Sciences de l'Information et de la Communication

HAL Id: hal-02100456
https://hal.archives-ouvertes.fr/hal-02100456
Submitted on 15 Apr 2019
HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.
L’archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d’enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.
Measuring green wood thermal properties to simulate
veneer production by ir-heating
Anna Dupleix, Andrzej Kusiak, Remy Marchal, Laurent Bleron, Louis Etienne
Denaud, Frederic Rossi
To cite this version:
Anna Dupleix, Andrzej Kusiak, Remy Marchal, Laurent Bleron, Louis Etienne Denaud, et al.. Mea-
suring green wood thermal properties to simulate veneer production by ir-heating. IUFRO Conference
Division 5 Forest Products, Technical session 5.02.00, Jul 2012, Estoril, Portugal. ￿hal-02100456￿
Contact: anna.dupleix@ensam.eu 
DUPLEIX A.1,KUSIAK A.2,MARCHAL R.1,DENAUD L.1, BLERON L.1, ROSSI F.1 
CURRENT VENEER MANUFACTURING PROCESS 
PR
O
JE
C
T 
B
A
C
K
G
R
O
U
N
D
 
SOAKING ① PEELING ② ③ PLYWOOD 
THERMAL SIMULATION OF FUTURE EMBEDDED IN-LINE IR HEATING SYSTEM 
 REPLACING 
SOAKING  
NUMEROUS 
 DRAWBACKS 
• Equations solver: 
Comsol Multiphysics® 
 
• Procedure implemented 
under MatLab® 
TH
E 
Q
U
ES
TI
O
N
 
HOW QUICKLY CAN THE HEAT ABSORBED BY THE SURFACE BE TRANSFERRED DEEP INTO WET WOOD BY CONDUCTION? 
(A0) 
IR 
2mm-depth 
1mm-depth 
surface 
Bolt cross-section 
(A) 
(A') 
(A'') 
Heat transfer modelling equations 
Cp heat capacity of the wood (in J.kg-1.K-1) 
Text external IR source temperature (in K) 
σ Stefan-Boltzmann's constant (in W.m-2.K-4) 
λ conductivity of wood (in W.m-1.K-1) 
ε wood emissivity 
h heat transfer coefficient (in W.m-2.K-1) 
T bolt temperature (in K) 
T)(λ∇=
t∂
T∂
pρC ∇
)4T-4extεσ(T+T)-exth(T=radQ
(2) 
(1) 
To integrate green wood optical properties : emissivity, transmittivity, absorptivity = f(source wavelength) to account for any volumic IR penetration 
        
4
extσT0I = β(1) with and 
4Tεσ-T)-exth(T=radQ (2) ∑
λ
r)λ(β-
0p e)λ(βI+T)∇(k∇=t∂
T∂
ρC wood absorption coefficient 
A
PP
R
O
A
C
H
 
MEASURING WET WOOD THERMAL CHARACTERISTICS USING HOTDISK® 
TRANSIENT METHOD TO FEED THE MODEL WITH PARAMETERS FUNCTION OF MC 
The HotDisk® probe gathers the 
heat source and the sensor to 
measure the evolution of 
temperature with time  
Transversal conductivity λtr (W/m.K)  
 the wetter wood, the more energy is required  to heat it 
 wet  wood diffuses heat more rapidly than dry wood 
 linear evolutions of λ, Cp and κ with MC provide equations to predict the thermal values function of MC 
Cp increases with MC λ increases with MC κ decreases with MC 
Heat capacity Cp (kJ/kg.K) Thermal diffusivity κ (mm2/s) 
R
ES
U
LT
S 
N
EX
T?
 
1 2 
MEASURING GREEN WOOD THERMAL PROPERTIES TO SIMULATE VENEER  PRODUCTION BY IR-HEATING 
in collaboration with  
1LaBoMaP, Arts et Metiers ParisTech  
rue Porte de Paris 71250 Cluny France 
2 I2M, Arts et Métiers ParisTech, Esplanade des 
Arts et Métiers, 33405 Talence Cedex France 


Measuring green wood thermal properties to simulate veneer production by ir-heating

https://hal.archives-ouvertes.fr/hal-02100456/document

Measuring green wood thermal properties to simulate veneer production by ir-heating

Abstract

Similar works

Full text

Available Versions

Archive Ouverte en Sciences de l'Information et de la Communication