Page 431 - Modelling in Transport Phenomena A Conceptual Approach

NOTATION 41 1

NOTATION

A area, m2
AH heat transfer area, m2
AM mass transfer area, m2
CP heat capacity at constant pressure, kJ/ kg. K
C total concentration, kmol/ m3
ci concentration of species i, kmol/ m3
D pipe diameter, m
DAB diffusion coefficient for system A-23, m2/ s
e total energy flux, W/ m2
FD drag force, N
f friction factor
9 acceleration of gravity, m/ s2
h heat transfer coefficient, W/ m2. K
J* molecular molar flux, kmol/ m2. s
K kinetic energy per unit volume, J/ m3
k reaction rate constant; thermal conductivity, W/ m. K
mass transfer coefficient, m/s
kc
L length, m
m mass flow rate, kg/ s
M molecular weight, kg/ kmol
N total molar flux, kmol/ m2. s
7i molar flow rate, kmol/ s
P pressure, Pa
P modified pressure, Pa
Q heat transfer rate, W
Q volumetric flow rate, m3/ s
9 heat flux, W/m2
r rate of a chemical reaction, kmol/ m3. s
!R Rate of generation per unit volume
R gas constant, J/ mol. K
T temperature, "Cor K
t time, s
V velocity of the plate in Couette flow, m/s; volume, m3
2) velocity, m/ s
W width, m
W total mass flux, kg/ m2. s
X fractional conversion
X rectangular coordinate, m
z rectangular coordinate, m
ai stoichiometric coefficient of species i
A difference