$y_1$	constricted channel’s lower wall
$y_2$	constricted channel’s upper wall
$h_1$	upper wall constriction height
$h_2$	lower wall constriction height
$\pi$	product of deformation rate’s component
${\pi }_c$	critical value of $\pi$
$p_y$	yield stress of the fluid
${\mu }_{\beta }$	plastic dynamic viscosity
$\tilde{u}$	velocity in $\tilde{x}$-direction
$\tilde{v}$	velocity in $\tilde{y}$-direction
$\rho$	density
$\tilde{p}$	pressure
$\mu$	dynamic viscosity
$\beta$	Casson fluid parameter
$k$	Thermal conductivity
$U$	characteristic flow velocity
$D$	coefficient of mass diffusivity
$\mathbf{J}$	current density
$\mathbf{B}$	magnetic field
$B_0$	uniform magnetic field strength
$\nu$	kinematic viscosity
$\xi$	Transformed $x$-coordinate
$\eta$	Transformed $y$-coordinate
$Pr$	Prandtl number
$c$	parameter defining weak/strong concentrations/turbulence
$\mathbf{E}$	electric field
$q$	radiative heat flux
$\sigma$	electrical conductivity
$c_p$	specific heat constant
$L$	length among channel walls
$T$	flow pulsation period
$St$	Strouhal number
$D_a$	Darcy number
$Re$	Reynolds number
$M$	Hartmann number
$\mu$	Dynamic viscosity
${\mu }_m$	medium’s magnetic permeability
$Rd$	Radiation parameter
$\phi$	concentration profile
$\theta$	temperature profile
$Sr$	Soret number
$Peh$	Peclet number for heat transfer
$Pem$	Peclet number for mass transfer
$\psi$	stream function
$\omega$	vorticity function
$Sk$	skin friction coefficient
$Nu$	Nusselt number
$Sh$	Sherwood number
$ϵ$	pulsating amplitude
$Re$	Reynolds number