Page 10 - Design and Operation of Heat Exchangers and their Networks

xiv Nomenclature

shell-side Reynolds number based on shell-side hydraulic diameter and mean
Re s
velocity
shell-side Reynolds number based on tube outside diameter and mean velocity
Re sd
tube-bundle Reynolds number based on tube outside diameter and maximum
Re tb
velocity
s space (m);
tube pitch (m);
3
volumetric heat source (W/m );
Laplace parameter (1/s)
s d diagonal tube pitch (m)
s f fin pitch (m)
s fs fin free spacing in width (m)
s l longitudinal tube pitch (m)
s ofs fin strip offset (m)
s t transverse tube pitch (m)
S salinity (kg/kg)
_ S entropy generation rate (W/K)
S p practical salinity (g/kg)
t temperature (°C)
T thermodynamic temperature (K)
T temperature vector (K)
u velocity (m/s)
maximum mean velocity (m/s)
u max
free stream velocity (m/s)
u 0
U heat transfer parameter, U¼kA (W/K)
heat transfer parameter, U L ¼kA/L (W/mK)
U L
3
v specific volume (m /kg)
3
V volume (m )
V velocity vector (m/s)
3
V volumetric flow rate (m /s)
w weighting factor
x spatial coordinate (m);
thermodynamic vapor quality
_ x vapor mass fraction
x i spatial coordinate (m)
y spatial coordinate (m)
z spatial coordinate (m)

Greek symbols

α heat transfer coefficient (W/m K)
2
β mass transfer coefficient (m/s);
1
thermal expansion coefficient (K );
chevron angle (corrugation inclination angle to main flow direction) (degrees or rad)
γ aspect ratio
Γ _ mass flow rate per unit width (kg/ms)