Št. zadetkov: 16
Izvirni znanstveni članek
Oznake:
cavitation;bubbles;erosion;materials;acoustic impedance;
In a study conducted over 10 years ago (Petkovsek and Dular, 2013) [1] we noticed that the thin metal sheet sustains less cavitation damage when it is attached to an acrylic glass (PMMA) than in the case when we attached it to quartz glass (SiO2). The reason for this was not explored at the time. In ...
Leto:
2023
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
laser-induced bubbles;nanobubbles;shockwave;gas diffusion;shadowgraph microscopy;
We have demonstrated the production of laser bulk nanobubbles (BNB) with ambient radii typically below 500 nm. The gaseous nature of the nanometric objects was confirmed by a focused acoustic pulse that expands the gas cavities to a size that can be visualized with optical microscopy. The BNBs were ...
Leto:
2023
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
cavitation;Kelvin-Helmholtz instability;Venturi microchannel;
The paper shows visualization of cavitation inside a micro-Venturi channel. While the initial aim of the study was to establish supercavitating conditions inside a micro-Venturi, yet we found that this regime is suppressed due to the formation of a Kelvin-Helmholtz instability, which triggers a semi ...
Leto:
2021
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
udarni valovi;računalniška dinamika tekočin;kavitacija;shock waves;cavitation;computational fluid dynamics;
We study the physical mechanisms behind the ejection of a liquid jet from a curved free surface, specifically a free-falling water drop. The jet is produced after a spherical shock wave emitted from a micro-explosion created by a focused laser pulse is refocused on the opposite side of its source. T ...
Leto:
2024
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
laser;nanobubbles;plasmonic bubbles;shockwaves;nanoparticles;
This study expands upon a technique our team previously developed for generating nanobubbles on demand with a collimated pulsed laser beam. This work highlights how the controlled addition of gold nanoparticles enhances nanobubble generation efficiency in water, even at laser intensities well below ...
Leto:
2024
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
acoustic cavitation;erosion;bubble clusters;laser breakdown;ultrasound;
Acoustic cavitation is achieved by exciting mechanical vibrations at ultrasonic frequencies, which in turn cause the formation of bubble clouds, followed by flows and emulsification. Typically, the effects of acoustic cavitation clouds on cleaning and erosion are difficult to predict or model due to ...
Leto:
2026
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
laser-induced cavitation;surface cleaning;bubble removal;shockwave;void fraction wave;
We study the interaction of laser-induced cavitation bubbles generated atop an electrode covered with hydrogen bubbles. The bubbles respond to the shock wave from laser-induced breakdown and the flow field of expanding and collapsing cavitation bubbles. High-speed imaging reveals that both the shock ...
Leto:
2026
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
kavitacija;mehurčki;cavitation;bubbles;
The existence of only a few bubbles could drastically reduce the acoustic wave speed in a liquid. Wood’s equation models the linear sound speed, while the speed of an ideal shock waves is derived as a function of the pressure ratio across the shock. The common finite amplitude waves lie, however, in ...
Leto:
2024
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
shock wave;cavitation;laser breakdown;laser illumination;
Leto:
2024
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
ultrazvočno slikanje;brizganje mehurčkov;mehka snov;strižni valovi;ultrasound imaging;bubble jetting;soft matter;shear waves;
In this methods paper, we explore the capabilities of high-speed ultrasound imaging (USI) to study fast varying and complex multi-phase structures in liquids and soft materials. Specifically, we assess the advantages and the limitations of this imaging technique through three distinct experiments in ...
Leto:
2024
Vir:
Fakulteta za strojništvo (UL FS)