Question: A convergent-divergent duct has a maximum diameter of 150 mm, and a Pitot- static tube is placed in its throat. Neglecting the effect of the Pitot-static tube on the flow, estimate the throat diameter under the following conditions:
(a) Air at the maximum section is of standard pressure and density, and the pressure difference across the pitt-static tube ≡ 127-mm water.
(b) Pressure and temperature in the maximum section are 100,300 N m-2 and 100?C, respectively, and the pressure difference across the pitt-static tube ≡ 127-mm mercury.