Page 35 - Separation process engineering

axial distance in bed (Chapters 15 and 16)
z
l
distance from downcomer exit to weir, m

Greek

α AB

K /K , relative volatility
B
A
α
thermal
2
thermal diffusity, m /s
β

A hole /A active
γ

activity coefficient

δ
thickness of mass transfer film or thickness of falling film, m

δ p

characteristic dimension of packing, inch, Eq. (10-38)
δ i

solubility parameter, Eq. (13-1)
Δ

change in variable or difference operator
ΔE v

latent energy of vaporization, Eq. (13-1)

ΔH
steady state height of dispersion band in settler, m

Δρ
|ρ - ρD|
C
ε

limit for convergence
ε ,ε , ε AB
A B
Lennard-Jones interaction energies, Table 15-2 and Eq. (15-22c)

η
fraction of column available for vapor flow

η
parameter, Eq. (15-42b)

θ
angle of downcomer, Figure 10-20B

λ