title: Universal scaling law for jets of collapsing bubbles.
abstract: Cavitation bubbles collapsing and rebounding in a pressure gradient ∇p form a "microjet" enveloped by a "vapor jet." This Letter presents unprecedented observations of the vapor jets formed in a uniform gravity-induced ∇p, modulated aboard parabolic flights. The data uncover that the normalized jet volume is independent of the liquid density and viscosity and proportional to ζ ≡ |∇p|R(0)/Δp, where R(0) the maximal bubble radius and Δp is the driving pressure. A derivation inspired by "Kelvin-Blake" considerations confirms this law and reveals its negligible dependence of surface tension. We further conjecture that the jet only pierces the bubble boundary if ζ ≳ 4 × 10(-4).
authors.affiliation: Laboratoire des Machines Hydrauliques, EPFL, Lausanne, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Obreschkow
authors.forename: M
authors.initials: M
authors.lastname: Tinguely
authors.forename: N
authors.initials: N
authors.lastname: Dorsaz
authors.forename: P
authors.initials: P
authors.lastname: Kobel
authors.forename: A
authors.initials: A
authors.lastname: de Bosset
authors.forename: M
authors.initials: M
authors.lastname: Farhat