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Showing 1 to 20 of 20 for “"Cavitation bubbles"”.
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The Dynamics of Single and Double Cavitation Bubbles and Interaction Between Bubbles and Different Materials
… impedance and thickness on single laser-induced cavitation bubble dynamics with measurements of exerted pressure on a specific material in order to identify the primary sources most responsible for material damages is presented in this article. Two types of major pressure sources have been …
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Free-Lagrange simulations of single cavitation bubble collapse.
… been applied to simulate the collapse of single cavitation bubbles near various boundary types. The simulations resemble an underwater explosion or laser- or spark-generated bubble, where the bubble evolution is driven by a high initial pressure difference between the bubble content and the …
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NUCLEATION AND DETECTION IN TENSION METASTABLE FLUIDS
… with atoms of TMFD fluids cause onset of cavitation bubbles. There are many applications and areas of science that would benefit from an increased knowledge about the relationship between the conditions and states of a metastable liquid and the appearance of cavitation bubbles due to …
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The Development of Spring-Actuated Mechanisms in Mantis Shrimp (Stomatopoda) and Snapping Shrimp (Alpheidae)
… pelagic organisms. Snapping shrimp generate cavitation bubbles using a LaMSA mechanism in their major claw. However, we do not know when the snapping shrimp LaMSA morphology or behavior emerges during development, nor whether they can generate cavitation bubbles at that size. In Chapter 3, I …
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Sustainable design and durability of domestic micro combined heat and power scroll expander systems.
… tribo-mechanical effects (abrasion, adhesion, cavitation, fatigue) which occur on the substrate of these components during the operation of the scroll which can seriously affect the lifecycle of the micro-CHP unit. Three-dimensional interferometer, surface scanning and scanning electron …
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High-Rate Histotripsy Methods for the Rapid Removal of Soft and Fibrous Tissue
… that uses the precise control of acoustic cavitation to disintegrate tissue. Acoustic cavitation is the transient expansion of pre-existing nuclei to dimensions orders of magnitude beyond their original size due to large increases in the tensile (peak-negative) pressure of the medium. The …
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Removal of Biofilm through Controlled Cavitation
… to the underlying material using controlled cavitation. The proposed method involves sonication or bombarding the material surface with cavitation bubbles to remove the bacterial biofilm.</p> <p>This thesis includes the various experiments done with respect to removal rate for varying …
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Deep Photoacoustic Imaging and Acoustic Cavitation Mapping in Shockwave Lithotripsy
… used in clinic. However, SWL can produce cavitation in vivo, and the rapid expansion and violent collapse of cavitation bubbles in small blood vessels may result in renal vascular injury. Current imaging modalities used in SWL (e.g., C-arm fluoroscopy and B-mode ultrasound) are not …
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AN EXPERIMENTAL AND NUMERICAL STUDY ON CAVITATION BUBBLE DYNAMICS AND ITS BIOMEDICAL APPLICATIONS
A thorough understanding of cavitation bubble dynamics is critical to mitigate cavitation damage or develop practical applications. An important field of study is the interaction of a single cavitation bubble with neighbouring structure(s). A cavitation bubble collapse near a finite elastic beam, …
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Transient Radicals Produced by Sonication and the Investigation of Paramagnetic Effects
… create free radicals by growth and collapse of cavitation bubbles. These free radicals have potential use in various fields. The formation of free radicals can be monitored by decrease in T1 during NMR experiments due to paramagnetic effects. Our goal is to develop a method in which ultrasound …
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High Intensity Ultrasound Processing of AlNi (50 wt.% Ni) Particles for Electrocatalytic Water Splitting
… to unravel the fundamental aspects of acoustic cavitation and their effect on sonicated matter as well as to explain the enhancement of electrocatalytic performance of the initially inactive metal alloy catalysts. Through the appropriate choice of sonication medium, concentration of sonicated …
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The physical response of soft musculoskeletal tissues to short pulsed laser irradiation
… expansion, expansion due to the formation of cavitation bubbles within the tissue was modeled. Cavitation occurs when tensile stresses rupture fluid. The laser-induced response of a gelatin phantom was measured with a Michelson interferometer and compared with predictions. Using gelatin as a …
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Experimental Study of Two-Phase Cavitating Flows and Data Analysis
Cavitation can be defined as the breakdown of a liquid (either static or in motion) medium under very low pressure. The hydrodynamic happened in high-speed flow, where local pressure in liquid falls under the saturating pressure thus the liquid vaporizes to form the cavity. During the evolution and …
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Hydraulic Mechanisms of Concrete-Tie Rail Seat Deterioration
… pressure cracking, hydro-abrasive erosion, and cavitation erosion. A laboratory test apparatus and procedure were devised to measure the surface water pressure in a laboratory rail seat using tie pads of differing material composition and surface geometry. To evaluate hydraulic pressure …
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On the fundamental mechanisms & optimisation of ultrasonic assisted liquid phase exfoliation of two dimensional nanomaterials
The application of ultrasound and acoustic cavitation in liquid exfoliation of bulk layered materials is a widely used method. Ultrasonic assisted liquid phase exfoliation (ULPE) is a promising procedure for the large scale production of two dimensional (2D) materials. As of this date, toxic …
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Flow Induced Failures of Copper Drinking Water Tube
… that include concentration cell corrosion, cavitation, particle/bubble impingement and high velocity impingement. Concentration cell effects resulting from exposing different copper surfaces to different flow regimes created a strong electrochemical cell that caused rapid corrosion that …
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Microbubbles can remove Listeria monocytogenes from the surface of stainless steels, cucumbers, and avocados
… produce become contaminated. In this project, a cavitation process (formation of bubbles in water) was studied to determine the efficacy of microbubbles at inactivating the pathogen L. monocytogenes on stainless steel and the surface of fresh cucumber and avocado. Stainless steel coupons …
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Methods for removing pharmaceuticals from human urine
… carbon, hydrogen peroxide and hydrodynamic cavitation. The pharmaceuticals investigated for this work were grouped into two categories: over the counter (OTC) common pharmaceuticals and the antiretrovirals (ARVs). The OTCs are used to treat a variety of common ailments such as pain, fever, …
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Cavitation and Bubble Formation in Water Distribution Systems
Gaseous cavitation is examined from a practical and theoretical standpoint. Classical cavitation experiments which disregard dissolved gas are not directly relevant to natural water systems and require a redefined cavitation inception number which considers dissolved gases. In a pressurized water …
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Effects of Cavitation on the Removal and Inactivation of Listeria and Salmonella from the Surface of Tomatoes and Cantaloupe
… fruit surfaces and can be difficult to remove. A cavitation process (formation of bubbles in water) was studied for its effectiveness for removal and inactivation of Listeria monocytogenes and Salmonella Newport from the surfaces of fresh Roma tomatoes and cantaloupes. Individual fruit were …