Parametric study on gate valve
Objective: perform a parametric study on the gate valve simulation by setting the opening from 10 % to 80%.
- Obtain the mass flow rates at the outlet for each design point.
- Calculate the flow coefficient and flow factor for each opening and plot the graph.
- Discuss the results of the mass flow rate and flow coefficient.
Geometry
Geometry is imported in SpaceClaim and fluid volume is created. Lift value of gate disc is set as a parameter.
Imported gate valve geometry
Fluid volume
Meshing
Element size:.05m
Solver setup
Material: water
Steady-state pressure-based solver
Turbulence model:k epsilon
Boundary conditions:
Inlet pressure = 10 pa
Outlet - Pressure outlet
Method: coupled
Result:
Design point 1
Section view of geometry
Velocity plot
Design point 2
Section view of geometry
Velocity plot
Design point 3
Section view of geometry
Velocity plot
Design point 4
Section view of geometry
Velocity plot
Design point 5
Section view of geometry
Velocity plot
Design point 6
Section view of geometry
Velocity plot
Design point 7
Section view of geometry
Velocity plot
Design point 8
Section view of geometry
Velocity plot
Mass flow rate on each design points
The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate.
`C_v = Q*sqrt((SG)/(DeltaP`
Q is the rate of flow (expressed in US gallons per minute)
SG = specific gravity
`DeltaP`= pressure drop across the valve (expressed in psi).
The metric equivalent flow factor (Kv; commonly used in Europe and Asia) is calculated using metric units.
`K_v=0.865*C_v`
Flow factor and Flow coefficients on each design points
Flow factor/Flow coefficient vs lift plot
Conclusion
- As the lift increases the outlet mass flow rate increases