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Using a flow coefficient (Cv value) in SymHydraulics

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Luuk Heijnders
Luuk Heijnders on 9 Sep 2015
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Commented: Luuk Heijnderson 11 Jan 2022
Hi all,
currently I want to use SimScape / SimHydraulics to model a system. For several components I have the Cv value (flow coefficient). This is defined as Q = Cv * sqrt(dp*rho_water/rho_liquid) But I cannot find the correct block to implement it. Any suggestions?
最好的问候,Luuk

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Answers (1)

Jocie Kluger
Jocie Kluger 2021年8月31日
One approach could be to use an Orifice block with area and discharge coefficient parameters. The flow rate equation of this block simplifies to Q= Cd*Area* sqrt(2*dp/rho_liquid). You could adjust the discharge coefficient and Orifice area so Cd*Area*sqrt(2) = Cv*sqrt(rho_water). Here are links to the Orifice blocks in the Isothermal Liquid and Hydraulics libraries:
//www.tianjin-qmedu.com/help/physmod/hydro/ref/orificeil.html
//www.tianjin-qmedu.com/help/physmod/hydro/ref/fixedorifice.html
Alternatively, you could use a Flow Coefficient block in the Thermal Liquid library. Use an Interface (TL-IL) block to interface this block with the Isothermal or Hydraulic network. Don't forget to add a Thermal Liquid properties block to the Flow Coefficient block to specify non-default TL fluid properties.
//www.tianjin-qmedu.com/help/physmod/hydro/ref/flowcoefficientparameterizedvalvetl.html
//www.tianjin-qmedu.com/help/physmod/hydro/ref/interfacetlil.html

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