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  • High speed observation of damage created by a collapse of a single cavitation bubble
    Dular, Matevž ...
    One of the remaining open questions in cavitation erosion research is the one on the importance of the microjet and the shock wave on the formation of the pit. Up until now, no successful attempt has ... been made to study this in detail, mainly because the damage could only be detected and evaluated after several successive bubble collapses. A bubble with a maximum diameter of up to 3.3 mm was created during photoionization using a Nd:YAG laser. The damage was observed on a 9 µm thick aluminum foil attached to a glass substrate. Two high speed cameras were simultaneously used. One captured the dynamics of the bubble, while the other recorded the damage of the foil. We also observed the collapse of a bubble in the presence of shear flow, where most of the damage is created by the microjet mechanism. Sometimes, the collapse of the bubble rim, at the rebound of the initial bubble causes pits in a well-known circular pattern. From the recordings at the very fastest acquisition rate, we determined that the material deforms and then partially relaxes, while a significant deformation remains. The whole process is only 2-3 µs long.
    Source: Wear. - ISSN 0043-1648 (Vol. 418/419, Jan. 2019, str. 13-23)
    Type of material - article, component part ; adult, serious
    Publish date - 2019
    Language - english
    COBISS.SI-ID - 16342555

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S0043164818308044
    Repository of the University of Ljubljana – RUL
    DOI

source: Wear. - ISSN 0043-1648 (Vol. 418/419, Jan. 2019, str. 13-23)
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