E4.1 Pitot Tube - Liquid Flow

Example 4.1: A pitot tube reads 1 in of mercury in a pipe. What is the velocity of the fluid through the pipe if fluid is water at 110 °F? Use the following information:

density of water (ρ) = 61.86 lb/ft³; density of mercury (ρ_m) = 840.68 lb/ft³

diameter of pipe, d = 0.335 ft, pitot coefficient, C = 1

Solution

Deflection in the manometer, h = 1 in = 0.0833 ft.

Pressure drop, ΔP (Equation 4.1):

Velocity of the fluid, V (Equation 4.2)

Cross-sectional area of the pipe, A:

Volumetric flow rate, q: