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Valve boundary conditions

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Old   October 6, 2004, 10:02
Default Valve boundary conditions
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I am modelling water flow through valves using Fluent to find out the throttling characteristics.Basicaly I would like to know what will the mass flow rate for various valve openings.Assuming that the pipe incorporating the valve being connected to a centrifugal pump on one side and open to the atmosphere on the other end, what type of boundary conditions should I give for different valve positions.

Thanking you.
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