SSC JE Civil Engineering 30-Oct-2020 Shift 1 Paper

Question : 200 of 200

Marks: +1, -0

Head loss due to friction in a circular pipe of diameter D, under laminar flow, is inversely proportional to:

Solution:

For steady laminar flow, head loss due to friction in a circular pipe is,

{\h}_{{\f}}={128 \µ{\QL}}/{\π\γ{\D}^{4}}

Head loss due to friction in a circular pipe of diameter D, under laminar flow, is inversely proportional to

\D^4

.
Laminar flow through a circular pipe:
Reynold’s number is important in the case of pipe flow.

{\R}_{{\e}}={\text " inertia force "}/{\text " viscous force " }={\ρ{\VD}}/{\µ}

\R_{\e}<2000

for laminar flow

{\R}_{{\e}}>4000

for turbulent flow

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