CF	Forchheimer’s constant
c	Constant pressure specific heat capacity, J∙kg−1∙K−1
Dh	Hydraulic diameter, mm
G	Width of heat sink cell, mm
K	Permeability, m2
k	Thermal conductivity, W∙m−1∙K−1
Lx	Length, mm
Ly	Width, mm
H	Height, mm
N	Number of cell
n	Normal direction of interface
P	Pumping power, W
p	Pressure, Pa
Q	Total heating power, W
$\mathit{q}$	Heat flux vector, W∙cm−2
$q^{″}$	Heat flux, W∙cm−2
S	Bottom area, mm2
${\dot{S}}_g$	Entropy generation rate, W∙K−1
T	Temperature, K
V	Velocity vector, m∙s−1
Vc	Volume of a cell, mm3
Vp	Volume of porous medium in a cell, mm3
Wc	Channel width of a cell, mm
Wr	Thickness of a rib, mm
Greek Letters
A	Aspect ratio of a cell
$\beta$	Length-width ratio of heat sink
$\rho$	Density, kg∙m−3
$\mu$	Dynamic viscosity coefficient, Pa∙s
$\varphi$	Volume proportion of porous medium
ε	Porosity
${\Phi }^{‴}$	Viscous dissipation function per unit volume
Superscripts
~	Dimensionless
Subscripts
eff	Effective
f	Fluid
in	Inlet
max	Maximum
opt	Optimal
out	Outlet
p	Porous medium region
s	Solid
Abbreviation
Be	Bejan number
DEGR	Dimensionless entropy generation rate
EGM	Entropy generation minimization
EGR	Entropy generation rate
HS	Heat sink
MCHS	Microchannel heat sink
PM	Porous medium
Re	Reynolds number