Page 141 - Modelling in Transport Phenomena A Conceptual Approach

NOTATION 121

NOTATION

A area, m2
a, packing surface area per unit volume, 1/ m
CP heat capacity at constant pressure, kJ/ kg. K
G concentration of species i, kmol/ m3
D diameter, m
Dh hydraulic equivalent diameter, m
DP particle diameter, m
DAB diffusion coefficient for system d-B, m2/ s
FD drag force, N
f friction factor
G mass velocity, kg/ m2. s
9 acceleration of gravity, m/ s2
jH Chilton-Colburn j - factor for heat transfer
jM Chilton-Colburn j - factor for mass transfer
IC thermal conductivity, W/ m. K
kc mass transfer coefficient, m/s
L length, m
M mass, kg
m mass flow rate, kg/ s
M molecular weight, kg/ kmol
n molar flow rate, kmol/ s
P pressure, Pa
Q heat transfer rate, W
e volumetric flow rate, m3/ s

4 heat flux, W/m2
R gas constant, J/ mol. K
T temperature, "C or K
t time, s
V volume, m3
2) velocity, m/ s
superficial velocity, m/ s
VO
'Ut terminal velocity, m/ s
W work, J; width, m
w rate of work, W
5 rectangular coordinate, m
A difference
€ porosity
E surface roughness of the pipe, m
P viscosity, kg/ m. s
v kinematic viscosity, m2/ s
P density, kg/ m3