LED-based PIV of a particle-laden turbulent free surface

A. Anand*, C. Poelma, A. Laskari

*Corresponding author for this work

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

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Abstract

An experimental method is proposed to study dispersed two-phase flows at an airwater interface, a family of flows of practical significance in environmental and industrial seĴings. The applicability of this technique is demonstrated through the study of a lightly-deformed turbulent free-surface laden with floating particles (`floaters'). A low-mean turbulent flow is generated in a turbulence box actuated by a 10×10 synthetic jet array. Using LEDs and a single camera, free-surface flow measurements are carried out by Particle Image Velocimetry (PIV) simultaneously with Lagrangian tracking of the floaters, allowing the potential to characterise the coupling between the floater dynamics and the (sub)surface flow. Discrimination of the dispersed and continuous phases is carried out based on size. Individual floaters and clusters of floaters are successfully tracked throughout the field of view while they navigate through elongated and circular regions of high and low vorticity, characteristic features typically observed when a subsurface turbulent flow interacts with a free surface. Preliminary results of the floater-fluid interactions are presented to highlight the potential of this technique to beĴer our understanding of floaterladen turbulent free surfaces.
Original languageEnglish
Title of host publicationProceedings of the 21st International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
PublisherLISBON Simposia
Number of pages14
ISBN (Print)978-989-53637-1-1
DOIs
Publication statusPublished - 2024
Event21st International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal
Duration: 8 Jul 202411 Jul 2024

Conference

Conference21st International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Country/TerritoryPortugal
CityLisbon
Period8/07/2411/07/24

Keywords

  • Turbulence
  • Multiphase flows
  • Free-surface
  • PIV
  • PTV

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