Assuming isothermal expansion from atmospheric pressure to the conditions obtaining at the traverse
plane:
Velocity is plotted against radius in Fig.7 and against (radius) 2 in Fig.8. The mean ordinate of the
latter curve, 89.1 ft/sec, gives the mean velocity at this cross section.
The corresponding calculated flow volume at atmospheric pressure is:
This agrees well with the calculated flow volume for the nozzle, 4.47 ft3/sec, and suggests that, for
the latter, a coefficient of discharge of substantially 1.00 is applicable instead of the assumed value of 0.985.