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Moody's diagram (short note)

1) It is a graph in non-dimensional form that relates the Darcy-weisbach friction factor ($F_D$), Reynolds number ($R_e$) 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 ($\Delta P$)

$\Delta P=\rho ghf$.

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

5) For laminar flow Regime ($R_e\lt\approx3000$). For flow regime, the relationship between the friction factor $F_D, R_e$ and relative roughness $\dfrac \varepsilon D$ is more complex.

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

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