You are pumping $1\mathrm{.}7$ kg$/$sec of a cold stream of monomer through $72$ m of $2\mathrm{.}5-$cm$-$diameter pipe to a reactor. At the entrance of the pipe, you inject $30$ pulses per second of catalyst with a small piston pump. When this stream reaches the reactor, the total stream is quickly heated, and polymerization begins. The cold stream has a specific gravity of $0\mathrm{.}83$ and a viscosity of $3\mathrm{.}7$ centipoises. How well will the catalyst be mixed by flow through the pipe?