Page 279 - Adsorption Technology & Design, Elsevier (1998)

254 Nomenclature

c* fluid phase concentration in equilibrium with mean sorbed phase
concentration
d diameter
d inside diameter of column
dp particle diameter
D diffusion coefficient
D flowrate of desorbent per unit cross section of column
D~ diffusivity in adsorbent crystal
Dk Knudsen diffusivity
DL axial dispersion coefficient
Dm macropore diffusivity
molecular diffusivity
DM
Dp micropore diffusivity
pre-exponential factor for surface diffusion
Do
concentration independent diffusivity
Do
D~ surface diffusivity
e bed voidage
E extract flowrate per unit cross section of column
E~ activation energy
heat of liquefaction
EL
E~ activation energy for surface diffusion
friction factor
f
factor defined in equation (6.62)
f
fugacity
f
feed rate per unit cross section of column
F
g acceleration due to gravity
Gibbs free energy
G
mass flux
G
heat transfer coefficient between fluid and wall
hi
h heat transfer coefficient between fluid and particle
H enthalpy
HETP height equivalent to a theoretical plate
HTU height of a transfer unit
collision integral
I
mass transfer factor
J
heat transfer factor
jH
constant in Freundlich equation (3.13)
k
mass transfer coefficient
k
Boltzmann constant
k
linear rate mass transfer coefficient
k
k adsorption rate constant in equation (6.43)
adsorption rate constant in equation (4.41)
ka