NDLI: CHARACTERIZATION OF THE ASYMMETRIC STREAMING FLOW INDUCED BY A FOCUSED ULTRASOUND TRANSDUCER

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CHARACTERIZATION OF THE ASYMMETRIC STREAMING FLOW INDUCED BY A FOCUSED ULTRASOUND TRANSDUCER

Content Provider	Hyper Articles en Ligne (HAL)
Author	Meziani, Estelle Inserra, Claude Grosjean, N. Blanc-Benon, Philippe Mauger, Cyril
Copyright Year	2023
Abstract	During high intensity focused ultrasound (HIFU) irradiation, different mechanical effects are induced such as acoustic streaming, cavitation bubbles and thermal deposition. These effects can be used for the dissolution of blood clots (thrombolysis), the destruction of kidney stones (lithotripsy) [1] or the thermal ablation of cancerous tumors [2]. Understanding the physics of these mechanisms is therefore essential in order to control them and improve the efficiency of treatment. Flows induced by focused ultrasound are generally considered as axisymmetric and then are studied by 2D Particle Image Velocimetry (PIV) techniques. However, beyond an applied acoustic pressure, the induced acoustic streaming is disturbed by cavitation bubbles whose spatial distribution is complex and may not be axisymmetric. In this study we characterize the tridimensional streaming induced by a focused ultrasound transducer in pulsed mode by using a 3D Lagrangian Particle Tracking Velocimetry (PTV) technique. Without cavitation, a steady state flow is not established, the maximum velocity is located at the focal zone and the flow is axisymmetric. In presence of cavitation, the bubble spatial distribution influences the acoustic field resulting in asymmetric streaming flow. While using pulsed sonication, the streaming becomes stationary for high cavitation activity.
Related Links	https://hal.science/hal-04255264/file/FA2023_Meziani_V2.pdf
Language	English
Publisher	HAL CCSD
Access Restriction	Open
Subject Keyword	Focused ultrasound Focused ultrasound acoustic streaming 3D-PTV cavitation 3D-PTV acoustic streaming cavitation
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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