Page 17 - Separation process principles 2

Nomenclature

Latin Capital and Lowercase Letters
A constant in equations of state; constant in Mar- CL constant in (6-132) and Table 6.8
gules equation; area for mass transfer; area for
Cv constant in (6-133) and Table 6.8
heat transfer; area; coefficient in Freundlich
equation; absorption factor = LIKV, total area Ch packing in 6.8
of a tray; frequency factor C, orifice coefficient
A, active area of a sieve tray Cp, Cp specific heat at constant pressure; packing con-
Ab active bubbling area of a tray stant in Table 6.8
ideal gas heat capacity at constant pressure
Ad downcomer cross-sectional area of a tray C&,
c molar concentration; constant in the BET equa-
A* area for liquid How under downcomer
tion; speed of light
Ah hole area of a sieve tray
c* liquid concentration in equilibrium with gas at
At binary interaction parameter in van Laar equa- its bulk partial pressure
tion
c' concentration in liquid adjacent to a membrane
Aij binary interaction parameter in Margules two- surface
constant equation
cm metastable limiting solubility of crystals
A,, B,, C,, D, material-balance parameters defined by
(10-7) to (10-11) c, humid heat; normal solubility of crystals
AM membrane surface area c, total molar concentration
A, pre-exponential (frequency) factor Acli~t limiting supersaturation
A, specific surface area of a particle D, D diffusivity; distillate flow rate; amount of distil-
late; desorbent (purge) flow rate; discrepancy
a activity; constants in the ideal-gas heat capac- functions in inside-out method of Chapter 10.
ity equation; constant in equations of state; in-
terfaEia1 area per unit voiume; surface area; DB bubble diameter
characteristic dimension of a solid particle; DE eddy diffusion coefficient in (6-36)
equivalents exchanged in ion exchange; inter-
D,, Deff effective diffusivity [see (3-49)]
facial area per stage
DH diameter of perforation of a sieve tray
ri interfacial area per unit volume of equivalent
clear liquid on a tray Di impeller diameter
ah specific hydraulic area of packing Dii mutual diffusion coefficient of i in j
amk group interaction parameter in UNIFAC D~ ICnudsen diffusivity
method DL longitudinal eddy diffusivity
a, surface area per unit volume DN arithmetic-mean diameter
constant in equations of state, bottoms flow Do diffusion constant in (3-57)
rate; number of binary azeotropes
Dp, D, effective packing diameter; particle diameter
rate of nucleation per unit volume of solution Dp average of apertures of two successive screen
molar availability function = h - TN; constant sizes
in equations of state; component flow rate in
D, surface diffusivity
bottoms; surface perimeter
DS surface (Sauter) mean diameter
general composition variable such as concen-
tration, mass fraction, mole fraction, or volume DT tower or vessel diameter
fraction; number of components; constant; volume-mean diameter
capacity parameter in (6-40); constant in tray DW mass-mean diameter
liquid holdup expression given by (6-50); rate
d component flow rate in distillate
of production of crystals
constant in (6-126) d, equivalent drop diameter; pore diameter
dH hydraulic diameter = 4rH
constant in (6-127)
dm molecule diameter
drag coefficient
entrainment flooding factor in Figure 6.24 and d, droplet or particle diameter; pore diameter
(6-42) d,, Sauter mean diameter defined by (8-35)

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