Since its introduction over 30 years ago,1 bubble CPAP has become an important part of the management of neonatal respiratory distress syndrome. Similar to “ventilatorderived” or “machine-derived” CPAP devices, bubble CPAP devices apply pressure to the neonatal respiratory system via nasal prongs placed into the infant’s nostrils, forming a tight seal to minimize leak. On the other hand, bubble...

This Brief Report presents experimental and computational results on bubble formation in microfluidic devices. Bubbles are generated at the right-angle intersection of four identical square microchannels. When the pressure gradient generated by the liquid flow dominates the pressure gradient generated by gas flow, the length of the produced confined bubbles follows a law based on the channel si...

A bstract During a cosmological first-order phase transition, particles of the plasma crossing bubble walls can radiate gauge boson. The resulting pressure cannot be computed perturbatively for large coupling constant and/or supercooling. We resum real and virtual emissions at all leading-log orders, both analytically numerically using Monte-Carlo simulation. find that radiated bosons are domin...

Nonlinear bubble dynamics are often viewed as the unfortunate consequence of having to use high acoustic pressure amplitudes when the void fraction in the near-surface oceanic bubble layer is great enough to cause severe attenuation (e.g. >50 dB/m). This is seen as unfortunate since existing models for acoustic propagation in bubbly liquids are based on linear bubble dynamics. However, the deve...

The inertial cavitation of bubble clouds has been considered to be the hidden crucial mechanism for recent new therapeutic ultrasound applications such as Histotripsy and the ultrasound drug delivery. Although many models are already put forward to simulate the cavitation process, due to the inaccessible experimental validation, which model works closest to the real world situation is not well ...

In the absence of coalescence, coarsening of emulsions (and foams) is controlled by molecular diffusion of the dispersed phase species from one emulsion droplet (or foam bubble) to another. Previous studies of dilute emulsions have shown how the osmotic pressure of a trapped species within droplets can overcome the Laplace pressure differences that drive coarsening, and " osmotically stabilise ...

The growth of a vapour bubble in a superheated liquid of variable surface tension and viscosity between two finite boundaries is introduced. The problem is solved analytically using the modified method of Plesset and Zwick method. The pressure difference is described in terms of temperature difference and initial pressure difference. The surface tension, viscosity, and initial and final time of...

This paper reports the first study of the O VI resonance line emission (λλ 1032, 1038) originating in the Local Bubble (or Local Hot Bubble) surrounding the solar neighborhood. In spite of the fact that O VI absorption within the Local Bubble has been observed, no resonance line emission was detected during our 230 ksec Far Ultraviolet Spectroscopic Explorer observation of a " shadowing " filam...