Experimental study of cavitation erosion around a surface mounted semi circular cylinder

Saad Jahangir, Ebrahim Ghahramani, Magdalena Neuhauser, Sébastien Bourgeois, Rickard E. Bensow, Christian Poelma

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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The objective of this study is to investigate the collapsing behavior of cavitation, which leads to erosion. For this purpose, an experimental investigation was performed in a channel with a semi-circular cylinder obstacle at the Hydraulic Laboratory of ANDRITZ HYDRO in Vevey. Cavitation was achieved by employing a range of pressure differences over the test section. The obstacle promotes and localizes cavitation-induced erosion. The flow field behind the semi-circular cylinder was investigated as a characteristic example of bluff bodies, which exhibit a distinct separated vortex flow in their wake. A high-speed camera observed the cavitation behavior. At the same time, erosion tests were performed using paint (stencil ink). The intensity of cavitation is described by the cavitation number (σ), the lower the cavitation number, the higher the cavitation intensity. Three erosive cases at different cavitation numbers are presented here. The erosion (removal of paint) after 40-60 mins of operation revealed distinct and repeatable results. These results will serve as validation data for numerical studies. For a high cavitation number, a large number of Karman-vortex-like cavities are shed downstream of the obstacle. This results in a higher number of collapse events and ultimately more erosion. On the other hand, at lower cavitation numbers the erosion took place at the closure line of the cavity. We demonstrate that paint tests in combination with this geometry provide an efficient and economical way to investigate erosion patterns compared to expensive material loss tests.
Original languageEnglish
Title of host publication10th International Conference on Multiphase Flow (ICMF 2019)
Number of pages2
Publication statusPublished - 2019
Event10th International Conference on Multiphase Flow - Rio de Janeiro, Brazil
Duration: 19 May 201924 May 2019


Conference10th International Conference on Multiphase Flow
Abbreviated titleICMF 2019
CityRio de Janeiro
Internet address


  • cavitation erosion
  • vortex shedding
  • semi-circular cylinder


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