High speed water droplet impact erosive behavior on dry and wet pulsed waterjet treated surfaces

During water droplet impact onto a dry or wet rough solid surface, several phenomena affect the surface erosion process, such as splashing, crown formation, and small emission to name few. These have been extensively studied for various simple target geometries. However, studies on complex irregular asymmetric topographies resulting from waterjet treatment never conducted. Furthermore, very limited reports are found role of topography deformation development stress state. In present study, high speed impingements surfaces exhibiting coarse topographical features associated with ultrasonic pulsed modeled understand underlying mechanisms causing erosion. Impacts roughness values film thicknesses using three-dimensional coupled Eulerian–Lagrangian approach. A detailed comparative analysis model experimental material loss is provided. It was that synclastic curvature increases shock wave's strength many compression wavelets simultaneously emitted at each contact location in concentrated high-pressure zones. The treated thickness also greatly influence onset subsequent finger, secondary characteristics, stability. According numerical results, strong splashing patterns breakup generated create zones capable accelerating erosion, explaining enhanced performance process.