SSC JE Mechanical Engineering 27 Oct 2020 Shift 2 Papers

Question : 173 of 200

Marks: +1, -0

For a fully–developed flow of water in a pipe having a diameter 10 cm, velocity 0.2 m/s, and kinetic viscosity

10^{-5} m^2\/s,

what is the value of the Darcy friction factor?

Solution:

Given: D = 10 cm = 0.1 m, v = 0.2 m/s, v =

10^{-5} m^2\/s

Re={0.1×0.2}/{10−5}=2000

Therefore, it is laminar flow

f=64/2000=0.032

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