${\mathsf{\rho }}_{\mathrm{nf}}$	Density
μnf	Viscosity
Cpnf	Specific heat
knf	Conductivity
κ	Permeability
${\left({\mathsf{\rho }}_{\mathrm{nf}}{\mathrm{Cp}}_{\mathrm{nf}}\right)}_{\mathrm{eff}}$	Effective heat capacity
(knf)eff	Effective conductivity
Δp	Pressure difference
u,v,w	Velocity in x, y and z
p	Pressure
L	Block Length
$\overline{\mathrm{Nu}}$	Average Nusselt number
Nu	Local Nusselt number
f	Fanning friction factor
PEC	Performance Evaluation Criterion
D	Hydraulic diameter
uin	Inlet velocity