In this paper, we present an algorithm which can automatically recognize vapor bubbles in a seething liquid from an image sequence. The image sequences were taken with a high-speed video camera with one thousand images pro-second. Our algorithm was divided into two steps: the background image identification and the bubble recognition. In the first step, the technique for auto-focus was applied ...

Crystal formation on air bubble–liquid interface, as soft template to efficiently prompt nucleation of proteins.

With our recently developed deformation device, the in situ tensile tests of single crystal molybdenum nanowires with various size and aspect ratio were conducted inside a transmission electron microscope (TEM). We report an unusual ambient temperature (close to room temperature) super-plastic elongation above 127% on single crystal body-centred cubic (bcc) molybdenum nanowires with an optimize...

The acoustic nucleation threshold for bubbles trapped in cavities has theoretically been predicted within the crevice theory by Atchley and Prosperetti “The crevice model of bubble nucleation,” J. Acoust. Soc. Am. 86, 1065 1989 . Here, we determine this threshold experimentally, by applying a single pressure pulse to bubbles trapped in cylindrical nanoscopic pits “artificial crevices” with radi...

This thesis consists of an experimental investigation of the effect of surfactants on the boiling curve of water. Via adsorbtion to the boiling surface, surfactants alter the surface energy interaction during bubble formation at nucleation sites. The surfactants initially enhance the heat transfer coefficient at the onset of nucleate boiling due to higher nucleation density and higher bubble de...

Boiling--a process that has powered industries since the steam age--is governed by bubble formation. State-of-the-art boiling surfaces often increase bubble nucleation via roughness and/or wettability modification to increase performance. However, without active in situ control of bubbles, temperature or steam generation cannot be adjusted for a given heat input. Here we report the ability to t...

This article presents a laser strobe microscopy method for photographing fast transient microscale processes. The technique is illustrated by capturing time-lapsed images of bubble nucleation from pulse-heated thin films immersed in a pool of water. The method combines a pulsed laser for the light source and a microscope with 100 magnification of a heater element platinum film, 30 m long, 15 m ...

It has been an experimental challenge to test the rupture of liquids with homogeneous nucleation of vapor bubbles. Many prior studies suffered from the ubiquitous presence of impurities in liquids or at container surfaces that spontaneously nucleate and grow under tension. Here, we propose a microfluidic approach to eliminate such impurities and obtain homogeneous bubble nucleation. We stretch ...

Abstract We generalize the standard computation of homogeneous nucleation theory at zero temperature to a scenario in which the bubble shape is determined self-consistently with its quantum fluctuations. Studying two scalar models in 1+1 dimensions, we find the self-consistent bounce by employing a two-particle irreducible (2PI) effective action in imaginary time at the level of the Hartree app...