Page 18 - Separation process principles 2

xxii Nomenclature

E activation energy; dimensionless concentration partial molar enthalpy
change defined in (3-80); extraction factor H Henry's law coefficient defined by (6-121)
defined in (4-24); amount or flow rate of ex- residual of energy balance equation (10-5)
tract; turbulent diffusion coefficient; voltage; H,
wave energy; evaporation rate heat of adsorption
I? standard electrical potential heat of condensation
Eb radiant energy emitted by a black body heat of crystallization
ED activation energy of diffusion in a polymer heat of dilution
Eij residual of equilibrium equation (10-2) integral heat of solution at saturation
EMD fractional Murphree dispersed-phase efficiency heat of solution at infinite dilution
EMv fractional Murphree vapor efficiency molar enthalpy of vaporization
Eov fractional Murphree vapor point efficiency HG height of a transfer unit for the gas
E, fractional overall stage (tray) efficiency Hi distance of impeller above tank bottom
E, activation energy HL height of a transfer unit for the liquid
radiant energy of a given wavelength emitted HOG height of an overall transfer unit based on the
by a black body gas phase =
E{t]dt fraction of effluent with a residence time be- HOL height of an overall transfer unit based on the
tween t and t + dt liquid phase =
number of independent equations in Gibbs humidity
phase rule
molal humidity
AFaP molar internal energy of vaporization
percentage humidity
e entrainment rate; heat transfer rate across a
phase boundary relative humidity
F Faraday's constant = 96,490 coulomb/ saturation humidity i
g-equivalent; feed flow rate; force; F-factor saturation humidity at temperature T, 1
defined below (6-67) HETP height equivalent to a theoretical plate 1
Fb buoyancy force I
HETS height equivalent to a theoretical stage (same
Fd drag force as HETP)
FF foaming factor in (6-42) HTU height of a transfer unit
F, gravitational force h molar enthalpy; heat-transfer coefficient;
FHA hole-area factor in (6-42) specific enthalpy; liquid molar enthalpy; height
of a channel; height; Planck's constant =
FLV, FLG kinetic-energy ratio defined in Figure 6.24
Fp Packing factor in Table 6.8 hd dry tray pressure drop as head of liquid
Fsr surface tension factor in (6-42) hd, head loss for liquid flow under downcomer
FV solids volumetric velocity in volume per unit hdc clear liquid head in downcomer
cross-sectional area per unit time hdf height of froth in downcomer
F{tJ fraction of eddies with a contact time less than t hf height of froth on tray
number of degrees of freedom hl equivalent head of clear liquid on tray
f pure-component fugacity; Fanning friction fac- hL specific liquid holdup in a packed column
tor; function; component flow rate in feed; total tray pressure drop as head of liquid
residual h,
h, weir height
ff fraction of flooding velocity
pressure drop due to surface tension as head of
fi fugacity of component i in a mixture
liquid
f, volume shape factor
I electrical current
partial fugacity
i current density
f, function of the acentric factor in the S-R-K and
P-R equations Ji molar flux of i by ordinary molecular diffusion
relative to the molar-average velocity of the
G Gibbs free energy; mass velocity; volumetric mixture
holdup on a tray; rate of growth of crystal size
jD Chilton-Colburn j-factor for mass transfer =
Gij binary interaction parameter in NRTL equation
jH Chilton-Colbum j-factor for heat transfer r
g molar Gibbs free energy; acceleration due to
gravity j Chilton-Colburn j-factor for momentum trans-
fer
g, universal
go energy of interaction in NRTL equation ji mass flux of i by ordinary molecular diffusion
relative to the mass-average velocity of the
H Henry's law coefficient defined in Table 2.3; mixture.
Henry's law constant defined in (3-50); height
or length of vessel; molar enthalpy