Generation and control of helium-filled soap bubbles for large-scale PIV

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

25 Downloads (Pure)

Abstract

The operating regimes of an orifice-type helium-filled soap bubbles (HFSB) generator are investigated to characterize the properties of the resulting tracers. The geometrical properties of the bubbles as well as the production rate are studied with high-speed shadowgraphy. The weight of the tracers relative to the mass of displaced air is determined by Particle Image Velocimetry (PIV) measurements along the stagnation streamline ahead of a cylinder. The latter data yield the particle time response for several combinations of air, helium and soap flow rates. The bubble production rate appears to increase linearly with the air flow rate, whereas the bubble volume is found to be directly proportional to the ratio of helium and air volume flow rates. The HFSB tracing capability approaches that of an ideal tracer (i.e. shortest response time), when the volume flow rate of helium is approximately one thousandfold the soap flow rate. This study provides guidelines for operating HFSB generation systems within large-scale PIV experiments.
Original languageEnglish
Title of host publicationProceedings of the 19th international symposium on application of laser and imaging techniques to fluid mechanics
Number of pages17
Publication statusPublished - 2018
EventLXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal
Duration: 16 Jul 201819 Jul 2018
Conference number: 19
http://www.lisbon-lasersymposium.org/LXLASER2018

Conference

ConferenceLXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Abbreviated titleLXLASER2018
CountryPortugal
CityLisbon
Period16/07/1819/07/18
Internet address

Keywords

  • HFSB
  • neutrally buoyant particles
  • large-scale PIV

Fingerprint

Dive into the research topics of 'Generation and control of helium-filled soap bubbles for large-scale PIV'. Together they form a unique fingerprint.

Cite this