Home : Support : Online Help : MapleSim Toolboxes : MapleSim Hydraulics Library from Modelon : Restrictions : Basic : PressureDrop : ModelonHydraulics/Restrictions/Basic/PressureDrop/OrificeInput

Orifice Input $—$

 Equations $\left\{\begin{array}{cc}\left\{\mathrm{Aeq}=\frac{\mathrm{\pi }{\mathrm{Deq}}^{2}}{4},\mathrm{Deq}=\left\{\begin{array}{cc}\mathrm{command}& 0<\mathrm{command}\\ 0& \mathrm{otherwise}\end{array}\right\\right\}& \mathrm{orif}=\mathrm{Hydraulics.Restrictions.Basic.PressureDrop.orifinput.D}\\ \left\{\mathrm{Aeq}=\mathrm{smooth}\left(0,\left\{\begin{array}{cc}\mathrm{command}& 0<\mathrm{command}\\ 0& \mathrm{otherwise}\end{array}\right\\right),\mathrm{Deq}=2\sqrt{\frac{\mathrm{Aeq}}{\mathrm{\pi }}}\right\}& \mathrm{orif}=\mathrm{Hydraulics.Restrictions.Basic.PressureDrop.orifinput.A}\\ \left\{\mathrm{Aeq}=\frac{\mathrm{\pi }{\mathrm{Deq}}^{2}}{4},\mathrm{Deq}=\mathrm{smooth}\left(0,\left\{\begin{array}{cc}\mathrm{command}\mathrm{Dmax}& 0<\mathrm{command}\\ 0& \mathrm{otherwise}\end{array}\right\\right)\right\}& \mathrm{orif}=\mathrm{Hydraulics.Restrictions.Basic.PressureDrop.orifinput.Dr}\\ \left\{\mathrm{Aeq}=\mathrm{smooth}\left(0,\left\{\begin{array}{cc}\mathrm{command}\mathrm{Amax}& 0<\mathrm{command}\\ 0& \mathrm{otherwise}\end{array}\right\\right),\mathrm{Deq}=2\sqrt{\frac{\mathrm{Aeq}}{\mathrm{\pi }}}\right\}& \mathrm{otherwise}\end{array}\right\$

Variables

 Name Value Units Description Modelica ID $\mathrm{command}$ command $\mathrm{Deq}$ Equivalent diameter Deq $\mathrm{Aeq}$ Equivalent area Aeq

Parameters

 Name Default Units Description Modelica ID $\mathrm{orif}$ [1] orif ${p}_{\mathrm{nom}}$ ${10}^{6}$ $\mathrm{Pa}$ Nominal pressure drop pnom ${q}_{\mathrm{nom}}$ $1.89·{10}^{-5}$ $\frac{{m}^{3}}{s}$ Nominal volume flow rate qnom ${\mathrm{\rho }}_{\mathrm{nom}}$ $865$ $\frac{\mathrm{kg}}{{m}^{3}}$ Nominal density rhonom ${C}_{d}$ $0.707$ Cd

[1] $\mathrm{Hydraulics.Restrictions.Basic.PressureDrop.orifinput.D}$