Now showing items 1-10 of 44
Highly focused supersonic microjets
(Physical Review X, 7/9/2012)
This paper describes the production of thin, focused microjets with velocities of up to 850 m/s by the rapid vaporization of a small mass of liquid in an open liquid-filled capillary. The vaporization is caused by the ...
Spiraling bubbles: How acoustic and hydrodynamic forces compete
(Physical Review Letters, 5/21/2001)
Experiments to study the effect of acoustic forces on individual bubbles in shear flows have been carried out. In the system that we have used, the competition between acoustic and fluid dynamical forces results in a ...
Role of Air in Granular Jet Formation
(Physical Review Letters, 7/6/2007)
A steel ball impacting on a bed of very loose, fine sand results in a surprisingly vigorous jet which shoots up from the surface of the sand [D. Lohse et al., Phys. Rev. Lett. 93, 198003 (2004)]. When the ambient pressure ...
Spatial dependence of fluctuations and flux in turbulent Rayleigh-B ?enard convection
(Physical Review E, 11/26/2012)
Entrapped air bubbles in piezo-driven inkjet printing: Their effect on the droplet velocity
(The Physics of Fluids, 12/8/2006)
Air bubbles entrapped in the ink channel are a major problem in piezo-driven inkjet printing. They grow by rectified diffusion and eventually counteract the pressure buildup at the nozzle, leading to a breakdown of the ...
Asymmetry-induced particle drift in a rotating flow
(The Physics of Fluids, 7/11/2005)
We report on an intriguing phenomenon taking place in a liquid rotating around a fixed horizontal axis. Under suitable conditions, bubbles and particles are observed to drift along the axis of rotation maintaining a constant ...
Giant Bubble Pinch-Off
(Physical Review Letters, 4/21/2006)
Self-similarity has been the paradigmatic picture for the pinch-off of a drop. Here we will show through high-speed imaging and boundary integral simulations that the inverse problem, the pinch-off of an air bubble in ...
Efficient sonochemistry through microbubbles generated with micromachined surfaces
(Angewandte Chemie, 8/3/2012)
It's the pits: Increased efficiency and controllability of sonochemical reactions was achieved with silicon surfaces on which pits were micromachined to entrap gas, which, upon ultrasonic excitation, emits a stream of ...
Drop Impact on Superheated Surfaces
(Physical Review Letters, 1/20/2012)
At the impact of a liquid droplet on a smooth surface heated above the liquid’s boiling point, the droplet either immediately boils when it contacts the surface (“contact boiling”), or without any surface contact forms a ...
Homogeneous nucleation: Patching the way from the macroscopic to the nanoscopic description
(Proceedings of the National Academy of Sciences, 11/21/2016)