Question

Question 4: I would like to measure air flowing at 25 m/s using a pitot-static tube. Should I use mercury or water as the measurement fluid? Would you suggest using a manometer, inclined tube manometer or micromanometer for measurement? Assume that the flow is incompressible and inviscid, and you are doing the measurements at Flagstaff 7000ft above sea level

Answer 1

You should use water as the density of water is sufficiently large to that of air. (ρ_water >> ρ_air)

i will suggest micromanometer because the difference in height of the reference fluid (water) would be very less. so to better reading the difference in height of the fluid column , micromanometer would be helpful.

you can use the following formula to calculate the air speed

V =

2(stagnation pressure head - static pressure head)