Abstract
This short communication is based on a previous experimental study of liquid droplet impingement (LDI) erosion of groove roughness published in Wear 432–433 (2019). In the present study, further experiments were performed using a spray-jet apparatus to understand the erosion mechanism of triple and quadruple grooves using a scanning electron microscope. It was found that the erosion behavior of triple grooves is similar to that of double grooves, as reported in the previous article. However, the erosion behavior of the quadruple grooves is different from that of the double grooves owing to the presence of less eroded groove peaks far from the surrounding smooth walls. This is due to the weakened side-jet effect from the surrounding smooth walls on the isolated groove peak erosion. Furthermore, the role of the central smooth wall between two single grooves was studied, and a decreased erosion was observed with an increase in the length of the smooth wall. These experimental results explain the importance of the surrounding smooth walls on the erosion behavior of grooves.
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