Problem 4: A venturi meter is measuring the flow of water; it has a main diameter of 3.5 cm tapering down to a throat diameter of 1.0 cm. If the pressure difference is measured to be 18 mm Hg, what is the speed of water entering the venturi throat?
Main diameter = 3.5 cm = 0.035 m = d1 (say)
Cross-sectional area of main diameter =
Density of water = ρ = 1000 kg/m3
Velocity of water
Knowing the pressure difference and areas of cross-sections, put values in the formula to find the velocity of water.
Before handing on the solution, we must know that,
A = πr2 = π(d/2)2 and 1 mm-Hg = 133 pascal