# Design And Flow Through CFD Analysis Of Enclosed Impeller

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International Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 3 Issue 7, July - 2014Step2. Our CFD Analysis method is Cavity Patten so wehave to create Cavity model of above impeller.Step3. Save above Cavity model in *. IGES Format forImporting into ANSYS Workbench Mesh Module forMeshing.Figure 7.2 Cavity Model of ImpellerIJERTFigure 5.1 CFD methodologyStep4. Import above Cavity model in ANSYS WorkbenchMesh Module.6. BOUNDARY CONDITIONSCentrifugal pump impeller domain is considered as rotatingframe of reference with a rotational speed of 735 rpm. Theworking fluid through the pump is water at 27 0C. k-εturbulence model with turbulence intensity of 5% isconsidered. Inlet and outlet Pressure and mass flow rate of0.5 m3 /s are given as boundary conditions. Threedimensional incompressible N-S equations are solved withAnsys-CFX Solver.7. PROCEDURE OF CFD ANALYSISStep1. 3D Model of Impeller is generated inSOLIDWORKS 2009 as per above given Drawing.Figure 7.3 Cavity model of impeller in ANSYS WorkbenchStep5. Meshing of ImpellerMeshing Type: 3DType of Element: TetrahedralFigure 7.1 3D Model of ImpellerIJERTV3IS071198www.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)1368

International Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 3 Issue 7, July - 2014Step9. Define Heat Transfer and Turbulence model.No. of Nodes: 46403No. of Elements: 241146Figure7.4 Meshed Model of Impeller CavityFigure 7.7 Heat Transfer and Turbulence ModelStep6. Save above model in *.CMDB Format for importinginto ANSYS CFX Pre.IJERTStep7. Import above .CMDB File in ANSYS CFX Pre.Heat Transfer Model: Total EnergyTurbulence Model: k- epsilonWhere k is the turbulence kinetic energy and is defined asthe variance of the fluctuations in velocity. It hasdimensions of (L2 T-2); for example, m2 /s 2 .ε is the turbulence eddy dissipation (the rate at which thevelocity fluctuations dissipate), as well as dimensions of kper unit time (L2 T-3) (e.g., m2 /s 3 ).The k-ε model introduces two new variables into thesystem of equations. The continuity equation is then: ρ ρU 0 tand the momentum equation becomes ρU ρU U μef f U t P ′ μef f U T BFigure 7.5 Impeller Cavity in ANSYS CFX PreStep8. Define Water Particle Domain.Domain Type: FluidDomain Fluid: Water 5 mm ParticleDomain motion: RotatingDomain RPM: 735 rpmRotating about: Y AxisStep10. Define Hub as a Rotating WallWall Roughness: Smooth WallHeat Transfer: AdiabaticFigure 7.8 Hub as a Rotating WallStep11. Define Shroud as a Rotating Wall.Figure 7.6 Water Particle DomainIJERTV3IS071198www.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)1369

International Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 3 Issue 7, July - 2014Step14. Define Solver Control Criteria.Figure 7.9 Shroud as a Rotating WallStep12. Define inlet for ImpellerDefine inlet mass Flow Rate: 0.5 m3 /sStatic Frame to Total Temperature: 300 KFigure 7.12 Solver Control CriteriaNumber of Outer loop iteration: 100Convergence Criteria:Residual Target: 1e-4Step15. Run the AnalysisIJERT7.2 Results of Analysis:Inlet Angle: 140Outlet Angle: 200Figure 7.10 Inlet for ImpellerStep13. Define Outlet for ImpellerDefine Outlet mass Flow Rate: 0.5 m3 /sFigure 7.13 Velocity ContourFigure 7.13 shows minimum velocity is 1.035*101 m/s andmaximum velocity is 4.051*101 m/s.Figure 7.11 Outlet for ImpellerIJERTV3IS071198www.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)1370

Define inlet mass Flow Rate: 0.5 m. 3 /s Static Frame to Total Temperature: 300 K . Figure 7.10 Inlet for Impeller . Step13. Define Outlet for Impeller Define Outlet mass Flow Rate: 0.5 m. 3 /s . Figure 7.11 Outlet for Impeller . Step14. Define Solver Control Criteria. Figure 7.12 Solver

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