Conical-focusing: Mechanism for singular jetting from collapsing drop-impact craters
arXiv:2209.03659 · doi:10.1017/jfm.2022.1085
Abstract
Fast microjets can emerge out of liquid pools from the rebounding of drop-impact craters, or when a bubble bursts at it surface. The fastest jets are the narrowest and are a source of aerosols both from the ocean and a glass of champagne, of importance to climate and the olfactory senses. The most singular jets, which have a maximum velocity of 1374 m/s and diameter of 12 m under reduced ambient pressure, are produced when a small dimple forms at the crater bottom and rebounds without pinching off a small bubble. The rebounding of this dimple is purely inertial but highly sensitive on initial conditions. High-resolution numerical simulations reveal a new focusing mechanism, which drives the fastest jet within a converging conical channel, where an entrained air-sheet provides effective slip at the outer boundary of the conically converging flow into the jet. This configuration bypasses any viscous cut-off of the jetting speed and explains the extreme sensitivity observed in detailed experiments of the phenomenon.
arXiv comment5 pages, 5 figures. The supplementary file is attached in this link (https://github.com/ZIQIANG059/Supplementary-Material_Cone_Jetting/blob/main/Supplementary%20Material_Cone_Jetting.pdf)
References in corpus (13)
- Drop Splashing on a Dry Smooth Surface
- Impact forces of water drops falling on superhydrophobic surfaces
- Von Kármán Vortex Street within an Impacting Drop
- High-speed Jet Formation after Solid Object Impact
- Theory of the collapsing axisymmetric cavity
- Breakup of Air Bubbles in Water: Memory and Breakdown of Cylindrical Symmetry
- Air entrainment through free-surface cusps
- Supersonic Air Flow due to Solid-Liquid Impact
- Impacts on viscous fluids: on ejecta, corolla and splashes
- Scaling laws of top jet drop size and speed from bubble bursting including gravity and inviscid limit
- Multitude of singular jets during the collapse of drop-impact craters
- Dimple, jets and self-similarity in nonlinear capillary waves
- Comment on "Revision of Bubble Bursting: Universal Scaling Laws of Top Jet Drop Size and Speed"