Radial$-$flow reactors can be used to good advantage for exothermic reactions with high heats of reaction. The high radial velocities at the entrance to the reactor are useful in reducing hot

spots within the reactor. As fluid moves out into the reactor, the velocity, $U,$ varies inversely with $r$ :

$U_0\frac{m}{s}R{R}_{0}A+B,*C{k}_1$

$A+BC+Dxr50\mathrm{.}07k{g}^{-1}$