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Measurement of nuclei seeding in hydrodynamic test facilities

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Abstract

Microbubble populations within the test section of a variable-pressure water tunnel have been characterised for various operating conditions. The tunnel was operated with demineralised water and artificially seeded with microbubbles from an array of generators located in a plenum upstream of the tunnel contraction. The generators produce a polydisperse population of microbubbles 10–200 \(\upmu \hbox {m}\) in the diameter. The microbubbles are generated from supersaturated feed water within a confined turbulent cavitating microjet. The generator and tunnel operating parameters were systematically varied to map the range of nuclei concentrations and size ranges possible in the test section. Microbubbles were measured with Mie Scattering Imaging (MSI), an interferometric sizing technique. A new method was introduced to calibrate the detection volume and extend the dynamic range of the MSI. The acquisition and processing of microbubble measurements with MSI have a fast turn-around such that nuclei concentration measurements are approaching real time. Estimation of the total bubble concentration was within 5% of the sampled concentration after only 100 detections but 10\(^4\) were necessary for full histogram convergence. The tunnel is operated with water at low dissolved gas content to ensure all injected microbubbles dissolve and do not complete the tunnel circuit. As a result of this, the injected population is altered by dissolution as well as pressure change during the short residence between plenum and test section. The transformation is shown to be complex, changing with tunnel operating conditions. The measured test section nuclei populations were found to follow a power law for the higher concentrations. Test section nuclei concentrations of 0–24 \(\hbox {mL}^{-1}\) can be achieved through variation of generator and tunnel operating parameters.

Graphic abstract

a A schematic of the experiment. b Sample image data. c Measured concentration of the seeded microbubble cavitation nuclei. d Distribution of bubble concentration by size.

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Acknowledgements

This project was supported by the Australian Defence Science and Technology Group (Dr. Dev Ranmuthugala) through the 2017 U.S. Multidisciplinary University Research Initiative (Dr David Clarke), and the US Office of Naval Research (Dr. Ki-Han Kim, Program Officer) and ONR Global (Dr. Sung-Eun Kim) through NICOP S&T Grant no. N62909-15-1-2019. The authors are grateful for the technical assistance provided by Mr. Steven Kent and Mr. Robert Wrigley when conducting these experiments.

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  1. Australian Maritime College, University of Tasmania, Launceston, Australia

    Patrick S. Russell, Luka Barbaca, James A. Venning, Bryce W. Pearce & Paul A. Brandner

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  1. Patrick S. Russell
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  2. Luka Barbaca
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  3. James A. Venning
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  4. Bryce W. Pearce
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  5. Paul A. Brandner
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Correspondence to Patrick S. Russell.

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Russell, P.S., Barbaca, L., Venning, J.A. et al. Measurement of nuclei seeding in hydrodynamic test facilities. Exp Fluids 61, 79 (2020). https://doi.org/10.1007/s00348-020-2911-2

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