Abstract
A novel concept of vortical cleaning in porous surfaces is studied experimentally. A vortex ring of various strengths is made to interact with oil-impregnated porous surfaces with the aim of understanding the mechanism of oil ejection from the porous surface. The vortex dynamics involves different phenomena like vortex cancellation and Kelvin-Helmholtz instabilities. The cleaning takes place from both sides of the porous surface through an intricate interaction process characterized by Rayleigh-Taylor and Rayleigh-Plateau type instabilities that is studied in three different regimes: i) Penetration, ii) Bag formation, and iii) Bag breakup.
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