Nomenclature
9. NOMENCLATURE
J.kg—1.K—1
CP
Specific heat capacity
D
Diffusion coefficient
DE
Activation energy for diffusion
K
Dr
Reference diffusion coefficient
m2.s—1
E
Modulus of elasticity
MPa
EG
Green modulus of elasticity
MPa
EL
Longitudinal modulus of elasticity
MPa
hF
Heat—transfer coefficient
J
Mass flux of water from the surface of timber kg.m—2.s—1
km
Mass—transfer coefficient
L
Width of Sample
m
Mi
Moisture change
kg—1.kg—1
m2.s—1
W.m—2.K—1
m.s—1
205
Nomenclature
n
Number of experimental data points
Q
Total rate of heat transfer
W.m—2
t
Time
seconds
T
Temperature of the board
K
TG
Dry—bulb temperature
K
TS
Surface temperature
K
TW
Wet—bulb temperature
K
u
Air velocity
V
Acoustic speed
Weight
—
m.s—1
km.s—1
Weighting assigned to each experimental data point to
show how much confidence there is on the value. The
higher the uncertainty of the value, the lower the
weighting assigned.
X
Moisture content
—
kg.kg—1
206
Nomenclature
XExp
Experimental moisture content
kg.kg—1
Xfsp
Moisture content at fibre saturation point
kg.kg—1
Xi
Initial moisture content
kg.kg—1
XPred
Predicted moisture contents
kg.kg—1
YG
Bulk—air humidity
kg.kg—1
YS
Surface humidity
kg.kg—1
z
Distance from the surface
m
Greek Letters
β
Shrinkage coefficient
Δxi
Size of each layer
ε
Strain
ν
Kinematic Viscosity
(mm.mm—1)/(kg.kg—1)
m
mm.mm—1
m2. s—1
207
Nomenclature
W.m—1.K—1
λ
Thermal conductivity
λS
Heat of sorption
J.kg—1
λW
Latent heat of vaporization
J.kg—1
ρ
Timber density
kg.m—3
ρair
Density of air
kg.m—3
ρD
Basic Density
kg.m—3
ρG
Green density
kg.m–3
σ
Stress
ζ
Shrinkage
MPa
mm.mm—1
Subscripts
c
At the centre of the timber board
—
i
At node point i within the timber board
—
S
At the surface of the timber board
—
208