Calculate the speed at which the flow of water in a long cylindrical pipe of diameter 2cm becomes turbulent. Assume that the temperature is 20°C, so the viscosity h at this temperature = 1.0 × 10–3Pa.s. Critical reynolds number is 3000 for flow in a long cylindrical pipe.

Engineering

Physics

Liquid Pressure

Viscosity and Terminal Velocity New

BernoulIis Equation and Equation of Continuity

Question

Calculate the speed at which the flow of water in a long cylindrical pipe of diameter 2cm becomes turbulent. Assume that the temperature is 20°C, so the viscosity h at this temperature = 1.0 × 10^–3Pa.s. Critical reynolds number is 3000 for flow in a long cylindrical pipe.

0.3 m/s

1.15 m/s

2.15 m/s

0.15 m/s

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In terms of the reynolds number, the flow speed v = (ηR) / (ρd).R_critical = 3000 for flow in a long
cylindrical pipe.
After substituting the values
v_critical = 0.15 m/s