What is d=?
Ethyl alcohol (density p = 789 kg/m^3, viscosity = 1.19 x 10^-3 PaĆĀ·s) flows through a pipe of diameter D = 60 mm in a refinery. The pressure drop across the Venturi meter used to measure the flow rate Q is p = 4 kPa when the flow rate is Q = 0.003 m^3/s.
Figure 1: The Venturi meter used to measure the flow rate.