a	Wavy amplitude (m)
C	Specific Heat $({\mathrm{J} \mathrm{kg}}^{-1}{ \mathrm{K}}^{-1}$)
D	Diameter $\left(m\right)$
K	Permeability of Porous Medium $({\mathrm{m}}^2)$
k	Thermal Conductivity $\left({\mathrm{W} \mathrm{m}}^{-1}{ \mathrm{K}}^{-1}\right)$
L	Length (m)
P	Dimensionless Pressure
p	Pressure (Pa)
S	Total Entropy
$S_{gen,T}$	Thermal Entropy Generation $\left({\mathrm{W} \mathrm{K}}^{-1}\right)$
$S_{gen,f}$	Friction Entropy Generation $({\mathrm{W} \mathrm{K}}^{-1}$)
T	Temperature $\left(\mathrm{K}\right)$
$U,V$	Dimensionless Velocity
$u,v$	Velocity Components (${\mathrm{m} \mathrm{s}}^{-1}$)
$X,Y$	Dimensionless Coordinates
$x,y$	Dimensional Coordinates (m)
Greek symbols
α	Thermal Diffusivity (${\mathrm{m}}^2{ \mathrm{s}}^{-1})$
λ	Wavelength (m)
β	Thermal Expansion Coefficient (${\mathrm{K}}^{-1}$)
ε	Porosity
θ	Dimensionless Temperature
ϑ	Kinematic Viscosity (${\mathrm{m}}^2{ \mathrm{s}}^{-1}$)
μ	Dynamic Viscosity (${\mathrm{kg} \mathrm{m}}^{-1}{\mathrm{s}}^{-1}$)
ρ	Density (${\mathrm{kg} \mathrm{m}}^{-3}$)
$\phi$	wavy-wall shift phase/degrees
$\varphi$	Volume Fraction
Subscripts
$av$	Averaged
f	Pure Fluid
s	Smooth
w	Wavy
$gen$	Generation
h	Hydraulic
m	Mixture
$np$	Nanoparticle
Abbreviations
CFD	Computational Fluid Dynamics
$Da$	Darcy Number
$Nu$	Nusselt Number
$Pr$	Prandtl Number
PEC	Performance Evaluation Criteria
$Re$	Reynolds Number
SIMPLE	Semi-Implicit Method for Pressure-Linked Equations