Question:

Darcy's equation is applicable for

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Darcy's equation is used for calculating frictional head loss in pipe flow.
  • Laminar flow only
  • Both laminar and turbulent flows
  • Turbulent flow only
  • Open channel flow only
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The Correct Option is B

Solution and Explanation

Concept:
Darcy's equation is used to calculate head loss due to friction in pipe flow.

Step 1:
When fluid flows through a pipe, friction occurs between fluid layers and pipe wall.

Step 2:
This friction causes loss of head or energy.

Step 3:
Darcy's equation gives the head loss due to friction in a pipe. \[ h_f=f\frac{L}{D}\frac{V^2}{2g} \]

Step 4:
According to the given answer key, Darcy's equation is applicable for both laminar and turbulent flows.

Step 5:
Therefore, the correct answer is both laminar and turbulent flows. \[ \boxed{\text{Both laminar and turbulent flows}} \]
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