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Hydro-abrasion study of rotating elements
Jahrestreffen der Fachgruppen Fluidverfahrenstechnik und Wärme- und Stoffübertragung, 20. – 21. März 2013, Baden Baden
Motivation
CFD simulation of slurry erosion
Mehdi Azimian and Hans-Jörg Bart TU Kaiserslautern, Lehrstuhl für Thermische Verfahrenstechnik,
67653 Kaiserslautern, Germany
E-Mail: [email protected]
Erosion: Exp. analysis & CFD simulations
Erosion influencing parameters determination
Material loss and surface deformation analysis
Modeling details:
4 erosion models from literature
E = k ∙ f m ∙ w θ ∙ g V ∙ h d ∙ j Hv
f(m): Solid particle concentration w(θ): Flow angle
g(V): Flow velocity h(d): Solid particle size j(Hv): Hardness of target surface
Water-sand; 2 way-coupling
Fig. 1: Slurry tank experimental setup
Conclusions
• Flow properties:
Impact velocity & angle, solid phase
concentration, apparatus geometry
• Solid particles properties:
Size, shape, hardness & density
• Interface:
Target material properties & particle impact
• Liquid-solid flow:
Water & Sand particles
• Specimens material:
Stainless steel 1.4301 Hardness: 235 HV30
• Good agreement of CFD with exp. Results
• Transient simulation results more precise than steady state
• Maximum erosion near edges • Erosion progress towards the
middle of surface
Outlook • Influence of particle breakup
effects on the erosion rate
• Geometry deformation effects on the erosion rate
Acknowledgement: The authors would like to thank ‘‘Stiftung Rheinland-Pfalz für Innovation‘‘ for the financial support.
Fig. 3: Computational grid of the slurry tank
Fig. 4: Erosion progress towards the middle of surface with a) 5%, b) 8%, c) 10% sand concentration
Fig. 10: Comparison of fluid & solid max. velocities Fig. 11: Comparison of fluid & solid avg. velocities
PIV measurements
Fig. 9: PIV measurement fields in the tank
Fig. 5: Material loss of eroded sample versus sand concentration Fig. 6: Material loss of eroded sample versus flow velocity
Fig. 2: Erosion sample holder & the mesh
Fig. 7: Erosion of stainless steel versus sand concentration Fig. 8: Erosion of stainless steel versus rotational velocity
Application of periodic GGI
Momentum transfer: Schiller-Naumann drag force model
Multiple reference of frames (MRF)
Multiple & replaceable mesh files
Steady state & transient simulations