Page 30 - Separation process engineering

power, W
Pe

dimensionless Peclet number in terms of molecular diffusivity, Eq. (15-33c)

Pe
dimensionless Peclet number in terms of eddy diffusivity, Eq. (16-111a)
Per f

flow perimeter, Figure 13-33B, m

Pr
dimensionless Prandt number, Eq. (15-33f)

q

L /F = (L – L)/F, feed quality
F
q

2
volumetric flow rate/plate width, m /s
Q
amount of energy transferred, Btu/h, kcal/h, etc.

Q c

condenser heat load
Q , Q C
c
3
volumetric flow rate continuous phase, m /s
Q , Q D
d
3
volumetric flow rate dispersed phase, m /s
Q flash

heat loss from flash drum

Q L
3
volumetric flow rate of liquid, m /s
Q R

reboiler heat load

Q
z
heat flux in z direction, J/s

r

radius of column, ft or m
R
3
gas constant, 1.9859 cal/(mol·K) or 8.314 m Pa/(mol·K)
R

raffinate flow rate (Chapter. 13), kg/h
R A

solute radius, m