Picture of athlete cycling

Open Access research with a real impact on health...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

Explore open research content by Physical Activity for Health...

Liquid velocity field measurements during bubble formation and detachment at an orifice

Vidinha, T. and Dempster, W.M. and Stickland, M.T. (2001) Liquid velocity field measurements during bubble formation and detachment at an orifice. In: 9th International Conference on Laser Anemometry, 2001-09-12 - 2001-09-14.

[img]
Preview
Text (strathprints005955)
strathprints005955.pdf - Accepted Author Manuscript

Download (565kB) | Preview

Abstract

This paper discusses the formation of gas bubbles at orifices with the purpose of experimentally investigating the influence of the surrounding liquid velocity field. The liquid velocity field measurements are established using PIV techniques utilising an Argon-ion laser to illuminate the fluorescent seeding. The images are recorded using high-speed digital video and the PIV results are obtained by cross correlation of the acquired images. Optical filters are used in an attempt to remove the glare from the bubble interface. The liquid velocity field was determined for the single bubble regime over a range of gas flowrates and orifice diameters of 2 mm and 6 mm. The investigation revealed a number of phenomena that are important to the growth of the bubble. These include liquid re-circulation due to necking, the extent of the influence of the preceding bubble and appearance of vortex rings generated by interface oscillations.