Cavitation bubble interaction with a rigid spherical particle on a microscale

date: 17.07.2020

category: Sporočila za javnost

 

In order to understand how cavitation destroys microorganisms, the Laboratory for Water and Turbine Machines (LVTS) in the frame of ERC project CABUM also performs numerical simulations of single cavitation bubbles. The results of their recent research were published in the journal Ultrasonics Sonochemistry (IF: 7.28), where they numerically addressed the dynamics of a single cavitation bubble in vicinity of a spherical particle on a microscale.

The main goal of the study was to determine the likelihood of previously suspected mechanical effects of cavitation to cause bacterial cell damage. The authors report, that microbubbles on the considered spatial scale behave differently than larger macrobubbles, which can be attributed to the effects of surface tension. Overall, the results show that the mechanical loads on a spherical particle tend to increase with its size and decrease with bubble-sphere distance. Potentially harmful mechanical effects are identified, namely the collapse-induced shear loads with peaks of a few megapascals and propagation of bubble emitted shock waves, which could cause spatially highly variable compressive loads with peaks of a few hundred megapascals and gradients of 100 MPa/μm.

The original scientific paper is available here.

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