KAUST DepartmentPhysical Science and Engineering (PSE) Division
Mechanical Engineering Program
Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Permanent link to this recordhttp://hdl.handle.net/10754/674033
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AbstractWhen a solid object impacts on the surface of a liquid, extremely high pressure develops at the site of contact. Von Karman’s study of this classical physics problem showed that the pressure on the bottom surface of the impacting body approaches infinity for flat impacts. Yet, in contrast to the high pressures found from experience and in previous studies, we show that a flat-bottomed cylinder impacting a pool of liquid can decrease the local pressure sufficiently to cavitate the liquid. Cavitation occurs because the liquid is slightly compressible and impact creates large pressure waves that reflect from the free surface to form negative pressure regions. We find that an impact velocity as low as ~3 m/s suffices to cavitate the liquid and propose a new cavitation number to predict cavitation onset in low-speed solid-liquid impact-scenarios. These findings imply that localized cavitation could occur in impacts such as boat slamming, cliff jumping, and ocean landing of spacecraft.
CitationSpeirs, N. B., Langley, K. R., Pan, Z., Truscott, T. T., & Thoroddsen, S. T. (2021). Cavitation upon low-speed solid–liquid impact. Nature Communications, 12(1). doi:10.1038/s41467-021-27383-5
SponsorsS.T.T. acknowledges early discussions with T. G. Etoh and K. Takehara. This work was supported by King Abdullah University of Science and Technology (KAUST).
PublisherSpringer Science and Business Media LLC