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# GATE 2025 FLUID MECHANICS 23

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Question 1

The value of friction factor(f) for both rough and smooth pipe is given by:

Question 2

By using the Nikuradse experiment, the pipe can be classified as:

Given thickness of the laminar sub-layer is 15 × 10–6 meters

equivalent roughness of pipe = 0.15mm

Question 3

Determine the distance from the pipewall at which local velocity is equal to the average velocity for turbulent flow in pipe

Question 4

Which of the following are correctly matched:

1. Turbulent flow = Moment Integral equation

2. Laminar flow = Hagen Poiseuille equation

Question 5

Water is flowing through a rough pipe of diameter 600 mm at the rate of 600/s The wall roughness is 3 mm. Find the power loast for 1km length of pipe.

Question 6

A 50 cm diameter pipe carries water (v = 0.294 × 10–6 m2/s) at an average velocity of 10 m/s . The roughness of pipe surface is 0.8 mm. For fully rough turbulent flow, What is the boundary shear stress.
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