Biomedical Engineering Reference
In-Depth Information
SYMBOLS AND NOMENCLATURE
A
area of the cross-sectional area of silo (m
2
)
B
parameter in
Eq. (12.1)
and
(12.3)
C
parameter in
Eq. (12.3)
d
p
particle size (m)
D
diameter of the silo (m)
D
0
diameter of the screw (m)
D
C
shaft diameter (m)
d
h
height of a differential element in the silo (m)
acceleration due to gravity (9.81 m/s
2
)
g
H
height of the silo (m)
k
f
wall friction coefficient (
)
K
Janssen coefficient (
)
K
i
a constant in
Eq. (12.9)
, depending on D
c
/D
0
or P/D
0
(
)
m
mass-flow rate (kg/s)
P
pitch of the screw (m)
P
w
normal pressure on the wall in the silo (Pa)
P
v
vertical pressure on the biomass in the silo (Pa)
P
0
pressure at the base of the silo (Pa)
T
torque of the screw (Nm)
V
0
average solid velocity through outlet (m/s)
τ
wall friction (Pa)
density of solids (kg/m
3
)
ρ
,
ρ
p
density of air (kg/m
3
)
ρ
a
σ
vertical stress for the flow (Pa)
v
μ
viscosity of air (kg/m s)
semi-included angle of hopper (
)
θ
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