Statistical Characterization of Helium-Filled Soap Bubbles Tracing Fidelity for PIV

Koen Morias, Giuseppe Carlo Alp Caridi, Andrea Sciacchitano, Fulvio Scarano

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

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Abstract

The present work follows a previous study on the aerodynamic characterization of helium-filled soap bubbles (HFSBs) for large-scale PIV measurements. HFSBs were found to yield, on average, a time response of about 10s. However, the response of each individual tracer remained to be ascertained, which is the topic of the present study. The velocity of the bubbles in the stagnation region ahead of a circular cylinder is evaluated by the PTV technique. The results are compared with micro-size fog droplets taken as reference. The tracking error of individual trajectories is assessed by statistical analysis of the relative slip between the bubble and the airflow. The instantaneous particle relaxation time is retrieved from the ratio between slip velocity and local acceleration. Additional information on the bubble instantaneous properties is taken by inferring the diameter from the distance between the glare points. The results are discussed and related to the differences observed in the bubbling and jetting regimes for bubble production. Finally, the HFSBs relative density to the air is estimated using a modified Stokes drag law.
Original languageEnglish
Title of host publicationProceedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Place of PublicationLisbon, Portugal
PublisherSpringer
Number of pages15
ISBN (Electronic)978-989-98777-8-8
Publication statusPublished - Apr 2016
Event18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - The Calouste Gulbenkian Foundation, Lisbon, Portugal
Duration: 4 Jul 20167 Jul 2016
Conference number: 18
http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/

Conference

Conference18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
CountryPortugal
CityLisbon
Period4/07/167/07/16
Internet address

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