Page 488 - Modelling in Transport Phenomena A Conceptual Approach

468 CHAPTER 10. UNSTEADY MICROSCOPIC BAL. WITHOUT GEN.

The maximum amount of species A absorbed by the droplet is given by
4
-
MA, = ,xP(c;I CA,)MA (10.3-63)
Therefore, the mass of species A absorbed by the droplet relative to the maximum
is

(10.3-64)

NOTATION

A area, m2
CP heat capacity at constant pressure, kJ/ kg. K
ci concentration of species i, kmol/ m3
DP particle diameter, m
'DAB diffusion coefficient for system A-t?, m2/ s
e total energy flux, W/ m2
FD drag force, N
h heat transfer coefficient, W/ m2. K
J* molecular molar flux, kmol/ m2. s
mass transfer coefficient, m/s
kC
L length, m
M mass, kg
m mass flow rate, kg/ s
M molecular weight, kg/ kmol
N total molar flux, kmol/ m2. s
n molar flow rate, kmol/ s
Q heat transfer rate, W
G? volumetric flow rate, m3/ s
Q heat flux, W/m2
R radius, m
T temperature, "C or K
t time, s
V velocity of the plate in Couette flow, m/ s; volume, m3
V velocity, m/ s
W width, m

a thermal diffusivity, m2/ s
6 penetration distance for momentum, m
6, penetration distance for mass, m