Bubble rising phenomenon is widely found in many engineering applications including stream generators in power plants. Many experimental and numerical researches have been performed to predict the dynamic behavior of the bubble rising process. Most simulations so far have focused on evolution behavior of the rising bubble itself. Rising bubbles could penetrate through the top free surface which...

The generation of arbitrarily shaped nonspherical laser-induced cavitation bubbles is demonstrated with a optical technique. The nonspherical bubbles are formed using laser intensity patterns shaped by a spatial light modulator using linear absorption inside a liquid gap with a thickness of 40 microm. In particular we demonstrate the dynamics of elliptic, toroidal, square, and V-shaped bubbles....

Bubbles can form in the body during or after decompression from pressure exposures such as those undergone by scuba divers, astronauts, caisson and tunnel workers. Bubble growth and detachment physics then becomes significant in predicting and controlling the probability of these bubbles causing mechanical problems by blocking vessels, displacing tissues, or inducing an inflammatory cascade if ...

OBJECTIVE Ultrasound (US)-mediated destruction of contrast microbubbles causes capillary rupturing that stimulates arteriogenesis, whereas intramuscular implantation (im) of bone marrow mononuclear cells (BM-MNCs) induces angiogenesis. We therefore studied whether US-targeted microbubble destruction combined with transplantation of BM-MNCs can enhance blood flow restoration by stimulating both ...

The single crystal 6H-SiC with [0001] crystal direction irradiated by 400 keV He⁺ ions with 1 × 1017 ions/cm² fluence at 400 °C were annealed at 600, 900, 1200 and 1400 °C for different durations. The evolution of helium bubbles and discs was investigated by transmission electron microscopy. An irradiated layer distributed with fine helium bubbles was formed with a width of ~170 nm after helium...

In this study, we develop a semi-automatic system for tracking bubbles in image sequences. The vapor bubbles are generated on the surface of a heated tube in a boiling liquid. The images are taken with a speed of one thousand images per second via a high speed digital video camera. Due to some physical properties such as the testing liquid, the surface structure of the heated tube, temperature,...

In this paper, effects of EHD actuators on hydrodynamic behavior and heat transfer of air flow over a circular cylinder were considered. Pressure and temperature distributions around the cylinder were measured in presence of wire-plate EHD actuators. The Reynolds number based on cylinder diameter (d) were 3500, 7000. Experiments were performed for various configurations. Based on obtained resul...

Th is work addresses the thermophysica l ph enomena of bubble formation by u sin g solid -state m icroh eaters and recommends specific d irections for fu tu re application s. Microscale bubble formation has become an im portan t actuation mechan ism for m icroflu id ic mach in es in the ( ) emerging field of m icroelectrom echan ica l system s MEMS . Characterization of m icrobu bble formation ...

Selective tissue damage on the cellular level can be achieved by microbubble formation around laser-heated intracellular pigments. To acquire a more detailed understanding of the laser tissue interaction in the highly pigmented retinal pigment epithelium (RPE), we irradiate aqueous suspensions of absorbing microparticles by short pulsed laser irradiation (12 ns, 240 ns, and 1.8 micros). Porcine...