For the conditions of Problem 13.122, find the length,
L, of commercial steel pipe of 2 in. diameter between sections 1 and 2 .
Consider the laboratory Fanno-line flow channel of
Problem 13.123. Assume laboratory conditions are 22.5C
and 760 mm of mercury (uncorrected). The manometer
reading at a pressure tap at the end of the converging nozzle
is 211.8 mm of mercury (gage). Calculate the Mach number
at this location. Determine the duct length required to attain
choked flow. Calculate the temperature and stagnation
pressure at the choked state in the constant-area duct.