Page 53 - Modelling in Transport Phenomena A Conceptual Approach

CHAPTER 2. MOLECULAR AND CONVECTIVE TRANSPORT

time, s
volume, m3
partial molar volume of species i, m3/ kmol
velocity, m/ s
molar average velocity, m/ s
volume average velocity, m/ s
total mass flux, kg/ m2. s
rectangular coordinate, m
mole fraction of species i
rectangular coordinate, m

thermal diffusivity, m2/ s
rate of strain, l/s
viscosity, kg/ m. s
kinematic viscosity (or, momentum dfisivity), m2/ s
total momentum flux, N/ m2
total density, kg/ m3
density of species i, kg/ m3
flux of 11: - momentum in the y - direction, N/ m2
mass fraction of species i
Overlines
per unit mass
I
- partial molar
Bracket

(a) average value of a
Superscript
sat saturation

Subscripts
A, B species in binary systems
ch characteristic
i species in multicomponent systems
Dimensionless Numbers
Le Lewis number
P~H Peclet number for heat transfer
P~M Peclet number for mass transfer
Pr Prandtl number
sc Schmidt number