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Flush-mounted rounded entrance

Flush-mounted rounded entrance d d r
Flush-mounted rounded entrance

Values for calculation

d \mathrm{mm}
r \mathrm{mm}

Calculation

Jet contraction ratio

λ=1+0.622\cdot\left(1-0.3\cdot\sqrt{\cfrac{r}{d}}-0.7\cdot\cfrac{r}{d}\right)^4

Loss coefficient

\text{if }\ r/d\geq 1
ζ=0.0696\cdot\left(1-0.569\right)
\text{else}
ζ=0.0696\cdot\left(1-0.569\cdot\cfrac{r}{d}\right)\cdot λ^2+\left(λ-1\right)^2

Discharge coefficient

μ=\cfrac{1}{\sqrt{ζ+1}}