Dear Bentley
Kindly i need to use the new option of (inlet valve throttle) for modelling float valve to control flow entering the tank. What should be discharge coefficient factor? Shall i put any value, if anyone have detailed explanation how to use this option this will be great help
Eng. Sayed Elhagar
Sayed,
The Discharge Coefficient (sometimes referred to as a "valve coefficient" or "Cv") is used to model the relationship between flow and headloss through the tank's float valve. It is This is important as the valve starts to throttle (to close the inlet pipe). The value to enter depends on the valve, so you may be able to obtain it from the manufacturer.
If this is not available, but you have the minor loss coefficient for the valve (K), then you can use the below equation:
K = Cf D^4 / Cv^2
where D = diameter (in., m)
Cv = valve coefficient [gpm/(psi)0.5, (m3/s)/(kPa)0.5]
Cf = unit conversion factor (880 English, 1.22 SI)
Furthermore, if still unsure, you could perform a sensitivity analysis, trying a range of reasonable values and checking the response. If the results that matter to you are not significantly effected, then you may not need to worry about how accurate the discharge coefficient is.
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Answer Verified By: Sayed Elhagar
Note that the information regarding the meaning of Discharge Coefficient is now documented in the below Support Solution:
communities.bentley.com/.../16758.meaning-of-discharge-coefficient-input-field.aspx