Journal of Heat Transfer, Vol. 121, No. 4. pp 770-773, November 1999

mass, of species i
mole, of species i
void
of volume flow
Frequency
circular
Gas Constant
molar (universal)
specific, of species i
Gibbs Function (= H - TS)
specific (= h - Ts)
molar ( = h −Ts)
Gravitational Acceleration
standard
Heat
quantity of
rate (power)
flux ( Q & / A)
rate per unit volume
QUANTITY SYMBOL COHERENT SI UNIT
x i , y i
⎯
x i , y i
⎯
ε
⎯
⎯
ε *
ν, f
ω
R
R i
G
g
g
Hz = s -1
rad/s
J/kmol K
J/kg K
J
J/kg
J/kmol
g
m/s 2
m/s 2
gn
S & , q&′′
′
W/m 3
Q
J
Q, & q
q &,
q ′′
W = J/s
W/m 2
Heat Capacity
specific (constant v or p)
C
c
v
, c
p
J/K
J/kg K
molar (constant v or p)
J/kmol K
c
v
, c
p
ratio c p /c v
⎯
γ
Heat Transfer Coefficient h W/m 2 K
Helmholtz Function ( = U - TS)
specific (= u - T s)
molar (= u − Ts )
F
f
f
J
J/kg
J/kmol
Intensity (radiation) I W/m 2 sr
Internal Energy
U
J
specific, molar
u, u
J/kg, J/kmol
Joule - Thomson Coefficient µJT =(∂T/∂p) h K/Pa = m 2 K/N
Length
width
height
diameter
radius
distance along path
film thickness
thickness
Mass
flow rate
velocity of flux (flowrate per unit area = M & /A c )
Mass Transfer Coefficient
L
W
H
D
R
s
δ
δ, ∆
M
M &
m&
, ρu
m
m
m
m
m
m
m
m
kg
kg/s
kg/m 2 s
hm , km
m/s
Molar Mass M kg/kmol
Mean Free Path λ , l m