Determination of the valve sizing coefficient of globe valve using CFD
Control Valve, Computational Fluid Dynamics
July 2009
K Yogesh, Kaivalya Bakshi
In this paper the flow past a 2" sized globe valve is numerically simulated and the valve sizing coefficient (CV) is calculated using CFD. A theoretical study using elementary techniques is exercised to understand the significance of the flow coefficient (CV) in predicting the mass flow rate through the valve. This exercise gives way to a clear understanding of the inherent simplicity of the function of a valve. A commercial grid generation tool ICEM-FLUENT is used for mesh generation. Commercial fluid dynamics code, ANSYS FLUENT is used for the flow modeling. For the static analysis, fully opened valve position is used and 1 atm through 7 atm of pressure difference (ΔP) is applied across the valve numerically. The numerical data obtained from the simulations is then used to calculate the flow coefficient (CV) computationally. From the results obtained it is found that the flow coefficient was indeed a constant for the same set of pressure differential and mass flow rate. The flow coefficient value is thus proved to be a function of the valve structure. By comparing between numerical and experimental results it is concluded that flow coefficient (CV) can be predicted with agreeable accuracy using computational techniques.
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