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Nozzle/Venturi

Nozzle/Venturi d d T d E l T l D α D r
Nozzle/Venturi

Values for calculation

d \mathrm{mm}
d_T \mathrm{mm}
d_E \mathrm{mm}
r \mathrm{mm}
f_T
l_T \mathrm{mm}
f_D
l_D \mathrm{mm}
α_D \mathrm{°}

Calculation

Diameter ratio

β=d_T/d

Diameter ratio for the stepped diffuser

β_E=d_T/d_E

0\le β_E\le 1

Jet contraction ratio

λ=1+0.622\cdot\left(1-0.3\cdot\sqrt{\cfrac{r}{d_T}}-0.7\cdot\cfrac{r}{d_T}\right)^4\cdot\left(1-0.215\cdot β^2-0.785\cdot β^5\right)

Loss coefficient

ζ=0.0696\cdot\left(1-0.569\cdot\cfrac{r}{d_T}\right)\cdot\left(1-\sqrt{\cfrac{r}{d_T}}\cdot β\right)\cdot\left(1-β^5\right)\cdot λ^2+\left(λ-1\right)^2+f_T\cdot\cfrac{l_T}{d_T}+8.3\cdot\left(\tan{\left(α_D/2\right)}\right)^{1.75}\cdot\left(1-β_E^2\right)^2+\cfrac{f_D\cdot\left(1-β_E^4\right)}{8\cdot\sin{\left(α_D/2\right)}}+\left(β_E^2-β^2\right)^2

Discharge coefficient

μ=\cfrac{1}{\sqrt{ζ+1}}