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Fiber-optic probe measurements of void fraction and bubble size distributions beneath breaking waves

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Abstract

Experiments were performed to determine the accuracy of single-tip fiber-optic probes for making simultaneous measurements of the void fraction and bubble size distributions under breaking waves. Tests in a vertical bubble column showed that the normalized RMS error in the void fraction measurements was ∼10%. The relationship between bubble rise time and bubble velocity was investigated in a unidirectional flow cell. Similar to previous studies the rise time and bubble velocity were found to be related by a power law equation. The probes can provide mean bubble velocities accurate to ±10% when a minimum of ∼15 individual bubble velocities are averaged. The fiber-optic probes were deployed beneath a plunging breaking wave in a laboratory wave channel. The slope and shape of the bubble cord length size distribution measured with the probes was found to agree closely with the size distribution measured from digital video recordings. The probes were then positioned in the splash-up zone of a plunging breaker and the resulting cord length distribution had a shape and slope that was in agreement with previous measurements. These results demonstrate that single-tip fiber optic probes can provide accurate simultaneous measurements of the void fraction and bubble sizes inside the dense bubble clouds entrained by breaking waves.

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Acknowledgments

We are grateful to the Natural Sciences and Engineering Research Council for financial support. The experiments comply with the current laws of the country in which they were performed.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Alberta, Natural Resources Engineering Facility, Edmonton, AB, Canada, T6G 2W2

    G. Rojas & M. R. Loewen

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  1. G. Rojas
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  2. M. R. Loewen
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Correspondence to M. R. Loewen.

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Rojas, G., Loewen, M.R. Fiber-optic probe measurements of void fraction and bubble size distributions beneath breaking waves. Exp Fluids 43, 895–906 (2007). https://doi.org/10.1007/s00348-007-0356-5

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  • DOI: https://doi.org/10.1007/s00348-007-0356-5

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