Our recent work with cavitation enhanced heating has shown that cavitation used with ablation can improve heating efficiency yielding larger lesions. In this study, we hope to optimize the ultrasound parameters for cavitation enhanced (CE) heating, understand the mechanisms of lesion formation, examine the potential side effects, and develop methods for monitoring and controlling this therapy. ...

Mechanical shock-induced nucleation (MSIN) of crystals from aqueous supersaturated solutions ammonium chloride is reported. A simple apparatus was constructed to expose in glass vials a single impact, while images were recorded using fast camera. strong correlation between cavitation the liquid and solid revealed. The measured fraction nucleated as function impact height fitted Poisson model. m...

In numerous industries such as drilling, peening, cleaning, etc., a cavitating jet is adopted. However, it challenging to simulate the flow field numerically with accuracy. The of organ pipe cavitation nozzle simulated in this research using RNG k−ε, DES, and LES turbulence models. model can more accurately predict periodic shedding cloud, which basically consistent morphology captured high−spe...

In this paper we present an algorithm for camera and projector calibration of the liquid crystal range nder using space encoding technique. Because the accuracy of calibration is aaected by noises, and the variation of position or scale of the reference object in the input images, the least-median-of-squares technique is used in our approach, instead of the conventional least squares method. Th...

This paper is intended to provide a potential basis for a numerical prediction of cavitation erosion damage. The proposed method can be divided into two steps. The first step consists in determining the loading conditions due to cavitation bubble collapses. It is shown that individual pits observed on highly polished metallic samples exposed to cavitation for a relatively small time can be cons...

Material deformation and pitting from cavitation bubble collapse is investigated using fluid and material dynamics and their interaction. In the fluid, a novel hybrid approach, which links a boundary element method and a compressible finite difference method, is used to capture non-spherical bubble dynamics and resulting liquid pressures efficiently and accurately. The bubble dynamics is intima...

OBJECTIVES Currently available fetal intervention techniques rely on invasive procedures that carry inherent risks. A non-invasive technique for fetal intervention could potentially reduce the risk of fetal and obstetric complications. Pulsed cavitational ultrasound therapy (histotripsy) is an ablation technique that mechanically fractionates tissue at the focal region using extracorporeal ultr...

Ultrasound induced cavitation has been explored as a method of dissolving intravascular and microvascular thrombi in acute myocardial infarction. The purpose of this study was to determine the type of cavitation required for success, and whether longer pulse duration therapeutic impulses (sustaining the duration of cavitation) could restore both microvascular and epicardial flow with this techn...