Biomedical Engineering Reference
In-Depth Information
t
time (s)
u
g
superficial gas velocity in
Eq. (7.79)
(m/s)
U
fluidization velocity (m/s)
U
B
bubble rise velocity (m/s)
U
mf
minimum fluidization velocity (m/s)
X
fractional change in the carbon mass of the biomass (
)
y
mole fraction of a species (
)
y
l
mole fraction of gas in the bulk (
)
y
ls
mole fraction of gas on the char surface (
)
z
height above grid or distance along a reactor from fuel
entry (m)
α
l,k
stoichiometric coefficient for lth gas in kth reaction (
)
β
partition coefficient (
)
λ
Lagrangian multiplier (
)
λ
g
thermal conductivity of gas (kJ/m K)
10
2
8
W/m
2
/K
4
)
σ
Stefan
Boltzmann constant (5.67
3
G
0
Δ
G
,
Δ
change in Gibbs free energy (kJ)
Δ
G
fi
change in Gibbs free energy of formation of species i (kJ)
Δξ
extent of gas-phase kth reaction (
)
k
density of jth gas (kg/m
3
)
ρ
j
Q
mf
voidage at minimum fluidization condition
ρ
density of the bulk gas
g
Δ
S
entropy change (kJ/K)
Search WWH ::
Custom Search