An in-depth process analysis of water jetting, a promising cost-effective drilling method for the exploration geothermal reservoirs, is presented. The jetting analyzed under submerged and pressurized conditions by complementary high-speed shadow imaging, particle image velocimetry, rock erosion analysis. shadowgraphy velocimetry experiments show that nozzle cavitation dominates process, it can ...

This paper discusses our efforts to simulate large systems of bubbles in complex geometries, with specific application to modeling cavitation instabilities. An important unstable regime is the transition from sheet-to-cloud cavitation (SCC). Experiments performed by Callenaere et al. (2001) highlight the unsteady flow structures of SCC, which is characterized by unstable regions of vapor bubble...

PURPOSE To determine the role of cavitational energy as a mechanism responsible for the emulsification of the lens during phacoemulsification. SETTING Clinica Ophthalmologica Pasteur, Santiago, Chile. METHODS Cavitation and its relationship to phacoemulsification power were documented using a combination of light sources, high-speed video recording techniques, and computerized control and b...

BACKGROUND Cavitation is a rather common and important effect in the processes of destruction of nano- and microscale particles in natural and technological processes. A possible cavitation disintegration of polymineral nano- and microparticles, which are placed into a liquid, as a result of the interaction of the particles with collapsed cavitation bubbles is considered. The emphasis is put on...

Abstract The paper concerns with the relationship between cavitation inception бi and sound pressure level (SPL). A case study of Xiaolangdi Hydro-project has been taken as a typical example, which demonstrates the standard criterion of SPL indicating cavitation inception. Cavitation inception of an orifice plate used for energy dissipation in a tunnel spillway has been witnessed and verified b...

Simultaneous measurements were made of the cavitation event rates on a Schiebe body and the nuclei number distributions in the oncoming stream in the Low Turbulence Water Tunnel at Caltech. Cavitation inception occurred at an average cavitation number of 0.57. Cavitation event rates increased dramatically as the cavitation number was decreased. It was also found that both the magnitude and the ...

Previous investigations showed that a single cavitation bubble collapse can cause more than one erosion pit (Philipp & Lauterborn [1]). But our preliminary study showed just the opposite - that in some cases a single cavitation pit can result from more than one cavitation event. The present study shows deeper investigation of this phenomenon. An investigation of the erosion effects of ultrasoni...

Cavitation erosion prediction and characterization of cavitation field strength are of interest to industries suffering from cavitation erosion detrimental effects. One means to evaluate cavitation fields and materials is to examine pitting rates during the incubation period, where the test sample undergoes localized permanent deformations shaped as individual pits. In this study, samples from ...

Background/introduction Cavitation-mediated therapies for the brain, such as ultrasound-induced Blood-Brain barrier opening and sonothrombolysis for the treatment of stroke, are being increasingly investigated. Robust methods for monitoring and controlling cavitation are necessary for safe translation of these techniques into clinical practice. This talk will review our work detecting and mappi...

Cavitation and turbulence inside a diesel injector play a critical role in primary spray breakup and development processes. The study of cavitation in realistic injectors is challenging, both theoretically and experimentally, since the associated two-phase flow field is turbulent and highly complex, characterized by large pressure gradients and small orifice geometries. We report herein a compu...