Page 79 - Modelling in Transport Phenomena A Conceptual Approach

60 CHAPTER 3. INTERPHASE TRANSPORT

Therefore, the evaporation rate of water from the surface is

hA = A(kc) (CAW - CA,)
= (1.5)(0.105)(2.19 x - 0) = 3.45 x kmol/s

NOTATION

A area, m2
AH heat transfer area, m2
AM mass transfer area, m2
CP heat capacity at constant pressure, kJ/ kg. K
G concentration of species i, kmol/ m3
DAB diffusion coefficient for system d-B, m2/ s
FD drag force, N
f friction factor
h heat transfer coefficient, W/ m2. K
jH Chilton-Colburn j - factor for heat transfer
jM Chilton-Colburn j - factor for mass transfer
K kinetic energy per unit volume, J/ m3
k thermal conductivity, W/ m. K
kc mass transfer coefficient, m/s
L length, m
M molecular weight, kg/ kmol
N total molar flux, kmol/ m2. s
ni molar flow rate of species i, kmol/ s
P pressure, Pa
Q heat transfer rate, W
4 heat flux, W/m2
QR heat flux due to radiation, W/m2
R gas constant, J/ mol. K
iR energy generation rate per unit volume, W/ m3
T temperature, "Cor K
t time, s
V velocity, m/s
w rate of work, W
5 rectangular coordinate, m
Y rectangular coordinate, m
a rectangular coordinate, m