Page 113 - ebook fluid mechanics_finalize

FLUID MECHANICS

Example 4.17

A Pitot Tube is used to measure air velocity in a pipe attached to a mercury manometer.

3
Head difference of that manometer is 6 mm water. The weight density of air is 1.25 kg/m .
Calculate the air velocity if coefficient of the pitot tube, C = 0.94.

Solution to Example 4.17

v air = C 2 gH

p water = p
air

 gh water =  gh
air

h water   water = h  
air
air
 1000
water
h water = . 0 006   air = . 0 006  . 1 25

4= 8 . m

So,

v = . 0 94 2 . 9 81 8 . 4 = . 9 12 m s /

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