Page 21 - Air pollution and greenhouse gases from basic concepts to engineering applications for air emission control

xxii Nomenclature
3
Sampled concentration (kg/m )
C s
3
The steady state concentration (kg/m )
C ss
3
Concentration corrected to 12 % CO 2 in the stack gas (kg/m )
C std
3
C x Exit concentration in adsorption (kg/m )
C u A coefficient (–)
Pressure drop coefficient (–)
C ΔP
d Diameter (m)
Aerodynamic particle diameter (m)
d a
Body diameter of granular filter bed (m)
d bed
Collision diameter (m)
d c
Characteristic dimension (m)
d c
Equivalent volume diameter (m)
d e
Aerodynamic focusing orifice diameter (m)
d f
Fiber diameter (m)
d f
d m Maximum diameter of the focused particles (m)
p
Particle diameter (m)
d p
Diameter of the granules (m)
d G
Cut size, particle size for which the separation efficiency is 50 % (m)
d 50
D Cyclone body diameter (m)
D Diameter of the tube (m)
D Characteristic length in Re (m)
2
D The diffusivity or diffusion coefficient of gas in air (m /s)
Diameter of gas exit of a cyclone (m)
D e
2
Diffusivity of the particles in the gas (m /s)
D p
e Coefficient of restitution (–)
e Enhanced absorption factor (–)
Kinetic energy for one mole of an ideal gas (–)
e k
E Electric field intensity (V/m)
Adhesion energy (J)
E ad
Activation energy (J/mol)
E A
f An empirical fitting factor (–)
f Correction factor to the plume rise due to stack downwash (–)
Dimensionless Darcy friction factor (–)
f D
Vapor mass fraction at the droplet surface (–)
f v
F Force (N)
4 3
Buoyancy flux (m /s )
F B
Centrifugal force (N)
F C
Drag force (N)
F D
4 2
Momentum flux (m /s )
F M
Fr Froude number (–)
2
g Gravitational acceleration, 9.81 (m/s )
G Mole flow rate of the gas mixture (mol/s)

G Mole flow rate of the solute-free carrier gas (mol/s)
Gr Gravity number (–)