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I want to use a solenoid valve to achieve two-phase flow on/off

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Hello,I want to use a solenoid valve to achieve two-phase flow on/off, I tried to use the Orifice (2P) module, but its cross-flow area cannot be set to 0 to be fully on/off.

Answers (1)

Yifeng Tang
Yifeng Tang on 2 Jan 2024
First, you'll almost never see a valve block to be complete "off" in a model. You'll always see a minimum area or flow fraction. This is to avoid a sudden change to the systems of equations in the middle of a simulation, so there is some good numerical reason behind this. Also, physically, a valve is never fully "off". Leakage is real. As long as the leakage is a neglible amount, you may consider the valve off.
Now, to your question. The Orifice (2P) block from the Simscape Fluids library is the right one to use. Its equations are a bit more robust than the ones in the Local Restriction block. I tends to get more stable results from Orifice (2P).




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