Abstract
AbstractCavitation in ball valve was numerically investigated using Computational Fluid Dynamics (CFD) modeling and then validated against results gained through experiments. The experiment was carried out in an assembly unit of the automotive industry to analyze flow patterns. The effect of bubbles on other thermophysical properties of the fluid was also examined using the multiphasek-ϵviscous model in ANSYS FLUENT. The impact of changes in inlet pressure on vapor fraction was visualized through simulations and validated against experimental data, cavitation was calculated via cavitation index equation. It was observed that cavitation values ranged from 0.51 to 0.84 through computational fluid dynamics and from 0.46 to 0.80 in the experiment. Moreover, fluctuations in Turbulence Kinetic Energy (TKE) in the fluid through the boundary layers in the valve region, deformation in fluid particles in the form of Strain Rate (SR), and variations in the value of Wall Shear Stress (WSS) of the valve's internal walls were also studied through numerical simulations. The results show the pressure just before the valve drops and result in cavitation. Besides, turbulence kinetic energy, shear stress on the walls of a valve, strain rate, and fluid velocity were gradually increased at inlet pressure resulting erosion in the ball valve.
Highlights
Cavitation in ball valve was numerically investigated using Computational Fluid Dynamics (CFD) modeling and validated against results gained through experiments
Cavitation was analyzed in a ball valve under the Schnerr Sauer cavitation model using ANSYS FLUENT
The result shows that the pressure drops down at vena contracta, the cavitation was observed in the fluid stream
Summary
Cavitation in ball valve was numerically investigated using Computational Fluid Dynamics (CFD) modeling and validated against results gained through experiments. Turbulence kinetic energy, shear stress on the walls of a valve, strain rate, and fluid velocity were gradually increased at inlet pressure resulting erosion in the ball valve. Inlet Pressure Orifice (vena contracta) Pressure Outlet Pressure Computational Fluid Dynamics Flow Coefficient Strain Rate Cavitation Equation Turbulence Kinetic Energy Vapor Pressure Wall Shear Stress Finite Volume Method Mass Transfer term with respect to Condensation Semi-implicit Method for Pressure Linked Equation Algorithm Flow Rate Reynolds Averaged Navier Stokes Equation Mass Transfer term concerning Evaporation Volumetric Average Flow Velocity Velocity Bubble Surface Temperature Geometric Factor Liquid Surface Tension Coefficient Gravity w.r.t Water Density Reynolds Number Cavitation Turbulence Model Vapor Phase Bubble Radius Vapor Density. Inspections of cavitation are indispensable to detect defects at an early stage and maintain proper functioning of the systems
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