$h$	heat transfer coefficient ($\mathrm{W}\hspace{0.17em}\hspace{0.17em}{\mathrm{m}}^{-2}\hspace{0.17em}\hspace{0.17em}{\mathrm{K}}^{-1}$)
$r$	radial coordinate (m)
$r_{eq}$	equivalent radius of the contact region (m)
$t$	time (s)
$t_c$	cooling time equal to $t_c=t_{end}-t_s$ (s)
$t_{end}$	total time of the braking and cooling process equal to 90 s (s)
$t_{\max }$	time, at which maximum temperature on the equivalent radius was reached (s)
$t_{s,i}$	braking time of the $i=0,\hspace{0.17em}1,\hspace{0.17em}2,\hspace{0.17em}3,\hspace{0.17em}4$ friction material (s)
$T$	temperature (°C)
$T_c^{(c)}$	temperature of the friction surfaces at $r=r_{eq}$, obtained using numerical model with connected clutch components at the end of cooling $t=t_{end}$
$T_c^{(d)}$	temperature of the friction surfaces at $r=r_{eq}$, obtained using numerical model with disconnected clutch components at the end of cooling $t=t_{end}$ (°C)
$T_{\max }$	maximum temperature obtained during braking at time $t_{\max }$ (°C)
$T_s$	temperature obtained at the end of braking process at time $t_s$ (°C)
$T_0$	initial/ambient temperature (°C)
$V$	linear velocity vector ($\mathrm{m}\hspace{0.17em}\hspace{0.17em}{\mathrm{s}}^{-1}$)
$x,\hspace{0.17em}y$	Cartesian coordinates (m)
$z$	axial coordinate (m)
Greek Symbols
$\omega$	angular velocity ($\mathrm{rad}\hspace{0.17em}{\mathrm{s}}^{-1}$)