22 research outputs found
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Illustrating the effect of viscoelastic additives on cavitation and turbulence with X-ray imaging
The effect of viscoelastic additives on the topology and dynamics of the two-phase flow arising within an axisymmetric orifice with a flow path constriction along its main axis has been investigated employing high-flux synchrotron radiation. X-ray Phase Contrast Imaging (XPCI) has been conducted to visualise the cavitating flow of different types of diesel fuel within the orifice. An additised blend containing Quaternary Ammonium Salt (QAS) additives with a concentration of 500 ppm has been comparatively examined against a pure (base) diesel compound. A high-flux, 12 keV X-ray beam has been utilised to obtain time resolved radiographs depicting the vapour extent within the orifice from two views (side and top) with reference to its main axis. Different test cases have been examined for both fuel types and for a range of flow conditions characterised by Reynolds number of 35500 and cavitation numbers (CN) lying in the range 3.0–7.7. It has been established that the behaviour of viscoelastic micelles in the regions of shear flow is not consistent depending on the cavitation regimes encountered. Namely, viscoelastic effects enhance vortical (string) cavitation, whereas hinder cloud cavitation. Furthermore, the use of additised fuel has been demonstrated to suppress the level of turbulence within the orifice
Characteristics of Bubble Oscillations During Laser‐Activated Irrigation of Root Canals and Method of Improvement
Characterization of the interaction of two oscillating bubbles near a thin elastic membrane
10.1007/s00348-012-1389-yExperiments in Fluids5361723-1735EXFL
Photodisruption of a thin membrane near a solid boundary: an in vitro study of laser capsulotomy
A collapsing bubble-induced microinjector: An experimental study
10.1007/s00348-008-0568-3Experiments in Fluids463419-434EXFL