Abstract
The erosion behavior of a cavitating jet on groove roughness was investigated experimentally using mass-loss characteristics, scanning electron microscopy (SEM) observation, time-resolved shadowgraph, and schlieren flow visualizations. The wall morphology of the cavitating-jet erosion on the groove roughness indicated an increased mass loss, which was highly increased along the groove rather than across the groove. Furthermore, increased erosion pits were observed on the groove bottom along the grooves. The shadowgraph imaging of the cavitating jet on the rough wall showed noncircular cavitation bubble distributions along and across the grooves, which corresponds to the increased number of cavitation bubbles along the grooves and the decreased number of bubbles across the grooves. This result is consistent with the erosion morphology of the groove roughness. Schlieren imaging indicated that the frequency and intensity fluctuation of the shockwave formation did not change significantly on the groove roughness along and across the grooves. The findings in the study show that the increased erosion mechanism on groove roughness is caused by the increased number of impulsive forces and the shockwave focusing effect on the groove bottom.
Highlights
Cavitating jets are applied to the fabrication, cutting, and peening of metal materials in industrial processing, owing to the highly erosive nature of the bubble behavior near the wall generated in a cavitating jet
The cavitation erosion is caused by the periodic formation of a cavitation cloud consisting of bubbles along the shear layer, which develops from the exit of the cavitation nozzle
The shadowgraph and schlieren flow visualizations of the cavitating jet were carried of 264 × 384 pixels with 8 bits operating at 100 kHz
Summary
Cavitating jets are applied to the fabrication, cutting, and peening of metal materials in industrial processing, owing to the highly erosive nature of the bubble behavior near the wall generated in a cavitating jet. For this reason, the erosion characteristics of wall materials in cavitating jet has been a topic of interest for years. These studies show that the cavitation cloud is caused by the re-entrant jet mechanism of the flow through the orifice in the cavitation nozzle [7,9,10,11,12]
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