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Lagrangian tracking of bubbles interacting with pin-fins in a microchannel

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Abstract

This paper presents new image analysis algorithms to measure the trajectories of breaking and coalescing bubbles in microscale bubbly flows. Image analysis of high-speed movies provides information on bubble dynamics and bubble interaction including bubble coalescence and breakage events. Individual bubbles that overlap in the image are recognized with a presented breakline method. The breakline method discriminates the overlapping bubbles with lines based on the bubble perimeter curvature analysis. Coalescence and breakage events are automatically recognized, and the path lines of bubbles travelling through the field of view are analyzed. The functionality of the algorithms was examined in bubbly flow in a microchannel encompassing two pin-fins in tandem.

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Acknowledgment

The work was supported by the Office of Naval Research (Program Officer Mark Spector) and the Academy of Finland. The microfabrication was performed in part at the Cornell NanoScale Facility (a member of the National Nanotechnology Infrastructure Network) which is supported by the National Science Foundation under Grant ECS-0335765, its users, Cornell University, and industrial affiliates.

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Authors and Affiliations

  1. Department of Energy and Process Engineering, Tampere University of Technology, P.O. Box 589, 33101, Tampere, Finland

    Markus Honkanen

  2. Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY, 12180, USA

    Daren Elcock, Chih-Jung Kuo, Yoav Peles & Michael Amitay

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  1. Markus Honkanen
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  2. Daren Elcock
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  3. Chih-Jung Kuo
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  4. Yoav Peles
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  5. Michael Amitay
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Correspondence to Markus Honkanen.

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Honkanen, M., Elcock, D., Kuo, CJ. et al. Lagrangian tracking of bubbles interacting with pin-fins in a microchannel. Exp Fluids 50, 1527–1538 (2011). https://doi.org/10.1007/s00348-010-1007-9

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  • DOI: https://doi.org/10.1007/s00348-010-1007-9

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