Nomenclature
Amem	total area of membrane [m2]
Ax	cross sectional intrinsic area at a boundary in the X direction [m2]
Ay	cross sectional intrinsic area at a boundary in the Y direction [m2]
c	molar concentration [mol/m3]
c 0	initial concentration [mol/m3]
ΔcB	concentration difference between inlet and outlet of a porous spacer unit cell [mol/L]
d	arm width of a porous spacer [m]
D	diffusion coefficient [m2/s]
F	Faraday constant (96,485 C/mol)
heff	effective mass transfer coefficient [m/s]
H	height of a porous spacer unit cell [m]
i	current density [A/m2]
L	length of a porous spacer unit cell unit [m]
LCD	limiting current density (LCD) [A/m2]
P	pressure [Pa]
q	molar flax [mol/(m2 s)]
Sheff	effective Sherwood number [-]
W	width of a porous spacer unit cell [m]
u,v,w	velocity vectors [m/s]
uB	intrinsic mean flow velocity [m/s]
X	length of dilute channel [m]
x,y,z	Cartesian coordinates [m]
ε	porosity [-]
ρ	density [kg/m3]
ν	kinetic viscosity[m2/s]
Subscripts
B	bulk
W	wall
in	inlet
out	outlet
min	minimum
1	Na+
2	Cl−