The Relation between the High Speed Submerged Cavitating Jet Behavior and the Cavitation Erosion Process

Hutli, Ezddin and Nedeljkovic, Milos and Radovic, Nenad and Bonyar, Attila (2016) The Relation between the High Speed Submerged Cavitating Jet Behavior and the Cavitation Erosion Process. International Journal of Multiphase Flow, 83. pp. 27-38. ISSN 0301-9322

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Abstract

In order to accurately and reliably evaluate the cavitation erosion resistance of materials using a cavitating jet generator, the effects of the hydrodynamic parameters and the nozzle geometry on the erosion process were investigated. Since the behavi our of a high speed submerged cavitating jet is also depending on the working conditions; their influence is also discussed based on the evaluation of cavitation erosion process . The erosion rate was used as an indic a tor for cavitating jet behaviour . Speci mens of commercial - purity copper were subjected to high speed submerged cavitating jets under different initial conditions, for certain time periods. The force generated by jet cavitation is employed to initiate the erosion in surface. The tested specimens were investigated with a digital optical microscope and a p rofilometer . It was found that erosion becomes more pronounced with decreas ing cavitation number s , as well as with increas ing exit jet velocit ies . The n ozzle configuration and hydrodynamic param eters have strong influence s on the erosion rate , eroded area and depth of erosion . A comparison between the obtained results explains some of the mechanisms involved in cavitation and erosion p rocesses and their relation to the tested parameters . Mathemat ical expressions which combine these parameters with the erosion rate are obtained . These parameters are very important in order to control the cavitation as a phenomenon and also to control the performance of the cavita ting jet generator .

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