Environmental Engineering Reference
In-Depth Information
[m.s
−1
]
!
diffusion velocity (vector)
[m
3
]
V
volume
X
i
mole fraction of species i
[
-
]
Y
i
mass fraction of species i
[
-
]
[m
2
s
−1
]
α
heat diffusion coefficient
α
absorptivity
[
-
]
[K
−1
]
β
coefficient of thermal expansion
ε
porosity
[
-
]
ε
e
emissivity
[
-
]
η
dynamic viscosity
[Pa
s]
θ
m
factor accounting for blowing effect in Equation (4.69)
[
-
]
θ
T
factor accounting for blowing effect in Equation (4.69)
[
-
]
ϑ
normalized moisture concentration
[
-
]
[m
−1
]
κ
absorption coefficient
m
−1
K
−1
]
λ
thermal conductivity
[W
wavelength
[m]
λ
[m
2
s
−1
]
ν
kinematic viscosity
m
−3
]
ρ
density
[kg
ρ
reflectivity
[
-
]
[m
−1
]
σ
scattering coefficient
m
−2
K
−4
]
σ
Stefan
-
Boltzmann constant
[W
τ
viscous stress tensor
[Pa]
τ
relaxation time
[s]
τ
tortuosity
[
-
]
[sr
−1
]
Φ
scattering phase function
m
−3
s
−1
]
ω
species mass source term
[kg
Subscripts
atm atmospheric
b
blackbody
b
bulk
B
biomass
boil
at boiling condition
C
char
d
droplet
eff
effective
F
fuel
g
gas
G
incident mean
i
species number i
I
inert gases
j
species number j
K
Knudsen
m
mixture
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