1. High-speed jetting and spray formation from bubble collapse
- Author
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Badarinath Karri, Evert Klaseboer, Boo Cheong Khoo, Silvestre Roberto Gonzalez Avila, Sean J. O’Shea, Yee Chong Loke, Claus-Dieter Ohl, and School of Physical and Mathematical Sciences
- Subjects
Length scale ,Physics ,Shock wave ,Jet (fluid) ,Shock (fluid dynamics) ,Physics::Instrumentation and Detectors ,business.industry ,Astrophysics::High Energy Astrophysical Phenomena ,Bubble ,Nucleation ,Mechanics ,Physics::Fluid Dynamics ,Micrometre ,Optics ,Perpendicular ,business - Abstract
A method to create impacting jets at the micrometer length scale by means of a collapsing cavitation bubble is presented. A focused shock wave from a lithotripter leads to the nucleation of a cavitation bubble below a hole of 25 $\ensuremath{\mu}$m diameter etched in a silicon plate. The plate is placed at an air-water interface. The expansion and collapse of the bubble leads to two separate jets---an initial slow jet of velocity $\ensuremath{\sim}$10 m/s and a later faster jet of velocity $\ensuremath{\sim}$50 m/s. The jets subsequently impact coaxially, resulting in a circular sheet of liquid in the plane perpendicular to their axis. The sheet is characterized by a ring of droplets at its rim and breaks up into a spray as the shock pressure is increased. The results demonstrate an approach to create a high-speed jet and fine spray on demand at the micrometer scale.
- Published
- 2012