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Write a short note on Moody's diagram

Write a short note on Moody’s diagram.

(5 Marks) May-2018, Dec-2018

Subject Fluid Mechanics 2

Topic Turbulent Flow

Difficulty Low

2 Answers
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1) It is a graph in non-dimensional form that relates the Darcy-weisbach friction factor (FD), Reynolds number (Re) and surface roughness for fully developed flow in a circular pipe.

2) It can be used to predict pressure drop or flow rate down such a pipe.

3) Formula for pressure drop (ΔP)

ΔP=ρghf.

4) Moody's diagram can be divided into two regims of flow, that is laminar and turbulent.

5) For laminar flow Regime (Re<≈3000). For flow regime, the relationship between the friction factor FD,Re and relative roughness εD is more complex.

6) It was plotted by Lewis Ferry Moody in the year 1944.

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