Fast x-ray imaging of cavitating flows

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August undefined, 2024

WebAug 1, 2009 · We propose a method of ultra-fast X-ray imaging to cope this lack. This method is based on X-ray absorption and phase-contrast enhancement. This technique can simultaneously measure the flow velocities of both liquid and vapor phases at kHz frequency. For the X-ray measurements, a dedicated Venturi shape canal has been … WebHigh-speed X-ray phase-contrast imaging of the cavitating flow developing within an axisymmetric throttle orifice has been conducted using high-flux synchrotron radiation. A white X-ray beam with energy of 6 keV was utilized to visualize the highly turbulent flow at 67 890 frames per second with an exposure time of 347 ns.

One-dimensional/three-dimensional analysis of transient cavitating flow …

Web157 ExpFluids(2024)58:157 13 Page4of22 where P vapisthevapourpressureatthetemperatureT of theow, V … WebDOI: 10.1016/J.NIMA.2009.03.192 Corpus ID: 122063994; Synchrotron ultra-fast X-ray imaging of a cavitating flow in a Venturi profile @article{Vabre2009SynchrotronUX, title={Synchrotron ultra-fast X-ray imaging of a cavitating flow in a Venturi profile}, author={Alexandre Vabre and Mehdi Gmar and Delphine Lazaro and Samuel Legoupil … hopital brignoles numero

Experimental investigation of internal two-phase flow structures …

WebOpen Access A new method based on ultra-fast X-ray imaging was developed in this work for the investigation of the dynamics and the structures of complex two-phase flows. In this paper, cavitation was created inside a millimetric 2D Venturi-type test section, while seeding particles were injected into the flow. Thanks to the phase-contrast enhancement … WebJul 9, 2024 · High-speed X-ray CT imaging of a strongly cavitating nozzle flow.pdf. Available via license: CC BY 3.0. ... Flows with cavitation are usually very fast and the frame rate of the. WebAug 1, 2009 · Cavitation. Venturi. X-ray ultra-fast imaging. Synchrotron applications. 1. Context, scientific stakes and objectives. Cavitation consists of successive vaporization … hopital bornem

The effect of transient needle lift on the internal flow and near ...

Fast X-ray imaging of cavitating flows (Journal Article) OSTI.GOV

WebAug 1, 2009 · Ultra-fast X-ray imaging. X-ray techniques have already been implemented to observe rapid liquid flows in microchannels [10], and also in PIV to. Results. Preliminary … WebJul 28, 2024 · The cavitating flows created in a small Venturi tube with throat cross section 4 × 15.34 mm2 are investigated based on ultra-fast x-ray imaging. long term skin conditionsWebNov 13, 2024 · The quasi-stable sheet cavitation produced in a small Venturi channel is investigated using a fast synchrotron x-ray imaging technique aided with conventional … hopital briey gynecologie

"WebHigh-speed visualization and time-resolved X-ray densitometry measurements are used to examine the cavity dynamics, including the time-resolved void-fraction fields within the cavity. The experimentally observed time-averaged void-fraction profiles are compared to an analytical model employing free-streamline theory. " - Fast x-ray imaging of cavitating flows

Fast x-ray imaging of cavitating flows

A comparative study of quasi-stable sheet cavities at different …

WebJan 9, 2024 · High-speed X-ray imaging of GDI injector nozzles is performed in this study. The experimental results presented are related to the internal flow and primary breakup of discharged liquid jets. The injectors used are equipped with nozzles made of aluminum which have been specially developed for these investigations to enhance optical … WebA new method based on ultra-fast X-ray imaging was developed in this work for the investigation of the dynamics and the structures of complex two-phase flows. In this paper, cavitation was created inside a millimetric 2D Venturi-type test section, while seeding particles were injected into the flow. Thanks to the phase-contrast enhancement …

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WebOct 20, 2024 · For cavitating flow containing water and vapor, the phase-contrast X-ray imaging technique has to be utilized to investigate this multiphase flow in various types … WebDec 11, 2024 · Vabre A, Gmar M, Lazaro D, et al. Synchrotron ultra-fast X-ray imaging of a cavitating flow in a venturi profile. Nucl Instruments Methods Phys Res Sect A, 2009, 607: 215–217. Google Scholar Gągol M, Przyjazny A, Boczkaj G. Wastewater treatment by means of advanced oxidation processes based on cavitation—A Review. Chem Eng J, …

WebA promising method to measure velocity fields in a cavitating flow is presented. Dynamics of the liquid phase and of the bubbles are both investigated. The measurements are … WebJan 1, 2012 · The cavitating flows created in a small Venturi tube with throat cross section 4 × 15.34 mm2 are investigated based on ultra-fast x-ray imaging.

WebApr 6, 2024 · Hydrodynamic cavitation is a complex two-phase flow phenomenon involving mass and heat transfer between liquid and vapor. It occurs in many widely-used … WebMar 24, 2024 · The Reynolds-averaged Naviers-Stokes (RANS) method coupling with cavitation model is still a practical tool to predict cavitating flows, ... “ Experimental investigation of internal two-phase flow structures and dynamics of quasi-stable sheet cavitation by fast synchrotron x-ray imaging,” Phys. Fluids 32, 113310 (2024).

In the present work, X-ray measurements were based upon two different mechanisms: absorption and phase-contrast enhancement. Commonly employed in numerous studies of two-phase flows using X-rays, absorption allows to obtain flow structures by means of energy attenuation. In fact, when an X-ray travels … See more The X-ray imaging technique of the APS Synchrotron has been utilised in a previous work by Im et al. (2007) for velocity measurements in a single-phase flow with a very low speed (80 \upmum/s), which required low … See more The quality of velocity measurements relies considerably on the characteristics of the tracers used during the experiments, which is all the more true in the case of two-phase flows given that particle detection is … See more

WebJul 26, 2010 · The present paper presents an experimental method to measure velocity fields in a cavitating flow. Dynamics of the liquid phase and of the bubbles are both … hôpital bourges ophtalmologieWebA new method based on ultra-fast X-ray imaging was developed in this work for the investigation of the dynamics and the structures of complex two-phase flows. In this paper, cavitation was created inside a millimetric 2D Venturi-type test section … hopital bourgoinWebAug 9, 2012 · No experiment was conducted, yet, to investigate the scale effects on the dynamics of developed cavitating flow with periodical cloud shedding. The present study was motivated by the unclear results obtained from the experiments in a Venturi-type section that was scaled down 10 times for the purpose of measurements by ultra-fast X-ray … long-term skin changes after radiation