Page 339 - Modelling in Transport Phenomena A Conceptual Approach

NOTATION 319

P pressure, Pa
0 heat transfer rate, W
c2 volumetric flow rate, m3/ s
4 heat flux, W/m2
R radius, m; resistance, K/ W
R gas constant, J/ mol. K
T temperature, "Cor K
t time, s
U overall heat transfer coefficient, W/ m2. K
V velocity of the plate in Couette flow, m/s; volume, m3
21 mass average velocity, m/ s
21' molar average velocity, m/ s
21. volume average velocity, m/ s
W width, m
W total mass flux, kg/ m2. s
xi mole fraction of species i
A difference
rl fin efficiency; effectiveness factor
x latent heat of vaporization, J
CL viscosity, kg/ m. s
U kinematic viscosity, m2/ s
K total momentum flux, N/ m2
P density, kg/ m3
Tij shear stress (flux of j - momentum in the i - direction), N/ m2
w mass fraction
Overlines
per mole
N
per unit mass
- partial molar
Bracket
(4 average value of a

Superscript
sat saturation
Subscripts
A, B species in binary systems
ch characteristic
GM geometric mean
i species in multicomponent systems
in inlet
LM log-mean
mix mixture