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ISRO VSSC Technical Assistant Mechanical held on 09/06/2019

Option 4 : Both b and c

CT 1: Growth and Development - 1

44334

10 Questions
10 Marks
10 Mins

**Explanation:**

**Frictional Head Loss in Pipe**

**Frictional energy loss per length of the pipe depends on the flow velocity, pipe length, pipe diameter, and a friction factor based on the roughness of the pipe, and whether the flow is laminar or turbulent**(i.e. the Reynolds number of the flow).- The
**total energy of the fluid conserves**as a consequence of the law of conservation of energy. - In reality, the
**head loss due to friction results in an equivalent increase in the internal energy**(increase in temperature) of the fluid. - The most common equation used to calculate frictional head losses in a tube or pipet is the
**Darcy–Weisbach equation**(head loss form).

\(Δ p = f_D\times{L\over D}\times{ρ V^2\over2}\)

where Δp = pressure loss, fD = darcy friction factor, L = length of pipe, D = hydraulic diameter, V = fluid flow average velocity, ρ = fluid density.

**As head loss or pressure loss due to friction in the pipe is **

**Directly proportional to the length of the pipe****Inversely proportional to the diameter of the pipe**.

Hence **the reduction in length and increase in diameter of the pipe will reduce frictional head or pressure loss.**