Nomenclature

$a$	Amplitude of the wavy channel (m)	Greek symbols
$B_0$	Magnitude of the applied magnetic field $\left(Wb/m^2\right)$	$\alpha$	Thermal diffusivity $\left(m^2/s\right)$
$Be$	Bejan number	$\beta$	Thermal expansion coefficient $\left(1/K\right)$
$c_p$	Specific heat at constant pressure $\left(J/kg.K\right)$	$\lambda$	Dimensionless wave length (m)
Da	Darcy number $\left(K/L^2\right)$	$\varphi$	Volume fraction of nanoparticles
$d_p$	Nanoparticle diameter $\left(nm\right)$	$\theta$	Dimensionless temperature $\left(\left(T-T_c\right)/\left(T_h-T_c\right)\right)$
$g$	Gravitational acceleration $\left(m/s^2\right)$	$\mu$	Dynamic viscosity $\left(kg/m.s\right)$
$Gr$	Grashof number $\left(g{\beta }_f\Delta T{L}^3/{\nu }_f^2\right)$	$\nu$	Kinematic viscosity $\left(m^2/s\right)$
$H$	Height of the channel $\left(m\right)$	$\rho$	Density $\left(kg/m^3\right)$
$Ha$	Hartmann number $\left(B_{0}L\sqrt{{\sigma }_f/{\mu }_f}\right)$	$\sigma$	Electrical conductivity
$K$	Permeability of the porous medium $\left(m^2\right)$	$\chi$	Irreversibility distribution ratio
$k$	Thermal conductivity $\left(W/m.K\right)$	$\epsilon$	Channel porosity
$K_B$	Boltzmann constant $\left(J/K\right)$	Subscripts
$L$	Length of the channel $\left(m\right)$	$A$	Alumina (Al2O3)
$n$	Normal unit vector	$av$	Average or mean
$Nu$	Local Nusselt Number	$c$	Cold
$\bar{N}u$	Average Nusselt number	$f$	Base fluid
$\mathrm{Pr}$	Prandtl number $\left({\nu }_f/{\alpha }_f\right)$	$h$	Hot
$p$	Dimensional pressure $\left(N/m^2\right)$	$nf$	Nanofluid
$P$	Dimensionless pressure	Abbreviations
$q_w$	Heat flux $\left(W/m^2\right)$	CWHTC	Channel with heated triangular cylinder
$\text{Re}$	Reynolds number $\left(u_{i}L/\nu \right)$	CWOHTC	Channel without heated triangular cylinder
$S$	Surface length of channel $\left(m\right)$	Liop	Length of inlet and outlet ports
$S_{eg}$	Entropy generation	$S_{FF}$	Fluid friction irreversibility
$S_T$	Total entropy generation	$S_{HT}$	Heat transfer irreversibility
$T$	Dimensional temperature $\left(K\right)$	$S_{MF}$	Magnetic force irreversibility
$T_0$	Mean temperature	FEM	Finite element method
$T_{ref}$	Reference temperature $\left(K\right)$	RSM	Response surface model
$u,v$	Dimensional velocity components $\left(m/s\right)$	CCD	Central composite design
$U,V$	Dimensionless velocity components
$x,y$	Dimensional coordinates $\left(m\right)$
$X,Y$	Dimensionless coordinates
$\bar{V}$	volume of the enclosure