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μ-PIV measurements of the ensemble flow fields surrounding a migrating semi-infinite bubble

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Abstract

Microscale particle image velocimetry measurements of ensemble flow fields surrounding a steadily migrating semi-infinite bubble through the novel adaptation of a computer controlled linear motor flow control system. The system was programmed to generate a square wave velocity input in order to produce accurate constant bubble propagation repeatedly and effectively through a fused glass capillary tube. We present a novel technique for re-positioning of the coordinate axis to the bubble tip frame of reference in each instantaneous field through the analysis of the sudden change of standard deviation of centerline velocity profiles across the bubble interface. Ensemble averages were then computed in this bubble tip frame of reference. Combined fluid systems of water/air, glycerol/air, and glycerol/Si-oil were used to investigate flows comparable to computational simulations described in Smith and Gaver III (J Fluid Mech 601:1–23, 2008) and to past experimental observations of interfacial shape. Fluorescent particle images were also analyzed to measure the residual film thickness trailing behind the bubble. The flow fields and film thickness agree very well with the computational simulations as well as existing experimental and analytical results. Particle accumulation and migration associated with the flow patterns near the bubble tip after long experimental durations are discussed as potential sources of error in the experimental method.

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Acknowledgments

This research is supported by NIH R01-HL81266. The authors would like to thank Dr. David Halpern and Anne-Marie Jacob for scientific discussion and advice.

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Authors and Affiliations

  1. Department of Biomedical Engineering, Tulane University, New Orleans, LA, 70118-5674, USA

    Eiichiro Yamaguchi, Bradford J. Smith & Donald P. Gaver III

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  1. Eiichiro Yamaguchi
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  2. Bradford J. Smith
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  3. Donald P. Gaver III
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Correspondence to Donald P. Gaver III.

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Yamaguchi, E., Smith, B.J. & Gaver, D.P. μ-PIV measurements of the ensemble flow fields surrounding a migrating semi-infinite bubble. Exp Fluids 47, 309–320 (2009). https://doi.org/10.1007/s00348-009-0662-1

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  • DOI: https://doi.org/10.1007/s00348-009-0662-1

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