Nomenclature
A area (m2)
D diameter (m)
Cp constant pressure specific heat (kJ/kg C)
L length (m)
m_ mass flow rate (kg/s)
Q heat transfer rate (kW)
q heat-flux (kW/m2)
T temperature (C)
DT outlet–inlet water temperature difference (C)
Rh hydraulic radius (m)
hfg latent heat of vaporization (kJ/kg)
k thermal conductivity (W/m K)
x rectangular length in horizontal direction
y rectangular length in vertical direction
Bo Bond number 4Rh g qlqv
r
12
(–)
Ja Jacob number hfg
Cp;lTv
(–)
Pr Prandtl number llCp;l
kl
(–)
Ku Kutateladze number q
qv hfg rg qv ql
q2v
h i14
0
B@
1
CA
(–)
Greek symbols
q density (kg/m3)
l viscosity (Pa s)
r surface tension (N/m)
Subscripts
c condenser
e evaporator
a adiabatic
l liquid
v vapor
cr cross sectional
sur out side surface